You know it's important for your web project to be accessible to people who use all kinds of assistive technology to access the internet. But all the guidelines for web accessibility you can find don't go much beyond "make sure all your images have alt text", and all the resources you can find treat "accessibility" as a synonym for "making your site work in a screen reader". You know there are other things you should be doing and other forms of assistive technology you should be accomodating, but all the best practices documents are a complicated morass of contradicting information (if you can find best practices documents at all.)
Have no fear! This tutorial gives you a number of concrete steps to take to make things more accessible.
This presentation has downloadable notes and exercises available at http://denise.dreamwidth.org/tag/a11y . Video of the talk should be available later.
Updated Feb. 9, 2014. This PPT is a review of color and fonts as used with HTML5 and CSS. Used in an undergraduate journalism class called Advanced Online Media Production.
Designing for Everyone: Building great web experiences for any deviceWindows Developer
"
As the capabilities of the web platform advance, and the pervasiveness of web content proliferates, fundamental design principles are more important than ever: How do you enhance your experience as new capabilities become available in Microsoft Edge and other browsers? You've considered how your content looks and operates on mobile, but how does that design adapt to desktop devices? Is it usable via ""headless"" interfaces like screen readers or Cortana? Does your content adapt gracefully to the constraints of its environment? In this session, Aaron Gustafson will help you think about user experience from its foundation, so you understand what it means to build adaptive web experiences – whether in an app, in a browser, or beyond. We’ll show you some of the newest capabilities coming to Microsoft Edge that let you build differentiated experiences on Windows 10. You’ll walk away practical, cross-platform code examples you can put to use in your projects today, and foundational principles to ensure that your projects are ready for anything. "
You know it's important for your web project to be accessible to people who use all kinds of assistive technology to access the internet. But all the guidelines for web accessibility you can find don't go much beyond "make sure all your images have alt text", and all the resources you can find treat "accessibility" as a synonym for "making your site work in a screen reader". You know there are other things you should be doing and other forms of assistive technology you should be accomodating, but all the best practices documents are a complicated morass of contradicting information (if you can find best practices documents at all.)
Have no fear! This tutorial gives you a number of concrete steps to take to make things more accessible.
This presentation has downloadable notes and exercises available at http://denise.dreamwidth.org/tag/a11y . Video of the talk should be available later.
Updated Feb. 9, 2014. This PPT is a review of color and fonts as used with HTML5 and CSS. Used in an undergraduate journalism class called Advanced Online Media Production.
Designing for Everyone: Building great web experiences for any deviceWindows Developer
"
As the capabilities of the web platform advance, and the pervasiveness of web content proliferates, fundamental design principles are more important than ever: How do you enhance your experience as new capabilities become available in Microsoft Edge and other browsers? You've considered how your content looks and operates on mobile, but how does that design adapt to desktop devices? Is it usable via ""headless"" interfaces like screen readers or Cortana? Does your content adapt gracefully to the constraints of its environment? In this session, Aaron Gustafson will help you think about user experience from its foundation, so you understand what it means to build adaptive web experiences – whether in an app, in a browser, or beyond. We’ll show you some of the newest capabilities coming to Microsoft Edge that let you build differentiated experiences on Windows 10. You’ll walk away practical, cross-platform code examples you can put to use in your projects today, and foundational principles to ensure that your projects are ready for anything. "
Where are (web) designers going with web fonts?Scott Boms
Presented during TypeCon 2011: Surge in New Orleans by Scott Boms (Butter Label/LL&S), Luke Dorny (Newsvine/Butter Label/LL&S) nad Brian Warren (Happy Cog/Butter Label/LL&S).
Green Hectares Rural Tech Factsheet – Website DesignGreen Hectares
The factsheet designed to accompany the Website Design presentation. Green Hectares offers this content as part of an initiative to enable rural communities with technology.
WordPress SEO in 2014 - WordCamp Baltimore 2014Arsham Mirshah
How WordPress and SEO come together in 2014 -- learn the anatomy of a well optimized page, plugins to help along the way, and other tips for using WordPress to maximize your SEO efforts.
More details can be found here: http://www.webmechanix.com/wordpress-seo-wordcamp-2014
Wordcamp, India 2009 - How to Implement SEO on a Wordpress Blog - Wordpress S...Abhinav Gulyani
Abhinav Gulyani aka Aby presents at India's First Wordcamp - On implementation of SEO on Wordpress Blog / Website. He also talks about Social Media Marketing, Microblogging, On Page SEO & Off Page SEO Wordpress Plugins, Wordpress SEO Tips.
GTM Clowns, fun and hacks - Search Elite - May 2017 Gerry WhiteGerry White
As Google becomes a JavaScript crawler, GTM becomes an incredible way to improve your site for both users and bots. This goes through some very simple methods, and what they can be used for...
Css Founder is Website Designing Company working with the mission of Website For Everyone Website Start From 999/-* More Packages are available. we are best company in website designing company in Delhi, as we are also working in Website Designing company in Mumbai.
Session presented in the european DrupalCon Dublin 2016. Video can be found here: https://www.youtube.com/watch?v=152J_74KGl0
It's been 6 years since the term Responsive Web Design (RWD) was coined and today is difficult to see new projects without implementing it. But this time has allowed us to see the implementation can be even more important than the technique and the theory. The RWD covers from the performance to the implementation of patterns and "standard" behaviors to improve usability.
In this session I reviewed tools, techniques and concepts to improve our projects:
⁃ Modern Design processes
⁃ Performance
⁃ CSS structuring and optimization (CSS Methodologies and Living Styleguides)
⁃ Fixed-pixel vs relative units (and Viewport Sized Units)
⁃ Responsive Typography and FOUT, FOIT
⁃ Images, Responsive images and SVGs
⁃ Asynchronous loading
⁃ Proxy-based browsers
⁃ Beyond the Mouse
⁃ RWD patterns and Progressively Disclosure
I showed simulations for a better understanding.
This session was aimed to anyone who wanted to improve his RWD knowledge, although a minimal RWD knowledge was expected.
Accessibility is important for anyone with a presence on the web. Here are five simple things you can do to make your web pages more accessible.
These are the slides from a talk given at WordCamp Buffalo on May 5, 2018.
We can pretend that we’re helping others by making websites and software accessible, but we are really making them better for our future selves. Learn some fundamentals of accessibility and how it can benefit you (whether future you from ageing or you after something else limits your abilities).
We’ll review simple testing techniques, basic features and enhancements, coming trends, and where to get help. This is an overall primer for those who aren’t sure where to start nor how it helps them.
Web accessibility refers to the inclusive practice of removing barriers that prevent interaction with, or access to, websites by people with disabilities. When your website is inaccessible, research shows you could be excluding up to 20 percent of your visitors from interacting with your content and functionality. If your university website is inaccessible, you could be preventing access to education, student services, and more.
When your website is accessible, everyone can consume your information freely. Visually-impaired users can visit your website using a screen reader. Those who can’t use a mouse can navigate your site using a keyboard or other input device.
While creating accessible websites involves every step, including design and content, the foundation for good accessibility starts with good markup. Join my workshop to learn more about accessibility and how to program a high-quality user experience that is inclusive and beneficial to all.
We can all pretend that we’re helping others by making web sites and software accessible, but we are really making them better for our future selves. Learn some fundamentals of accessibility and how it can benefit you (whether future you from aging or you after something else limits your abilities). We’ll review simple testing techniques, basic features and enhancements, coming trends, and where to get help. This isn’t intended to be a deep dive, but more of an overall primer for those who aren’t sure where to start nor how it helps them.
Where are (web) designers going with web fonts?Scott Boms
Presented during TypeCon 2011: Surge in New Orleans by Scott Boms (Butter Label/LL&S), Luke Dorny (Newsvine/Butter Label/LL&S) nad Brian Warren (Happy Cog/Butter Label/LL&S).
Green Hectares Rural Tech Factsheet – Website DesignGreen Hectares
The factsheet designed to accompany the Website Design presentation. Green Hectares offers this content as part of an initiative to enable rural communities with technology.
WordPress SEO in 2014 - WordCamp Baltimore 2014Arsham Mirshah
How WordPress and SEO come together in 2014 -- learn the anatomy of a well optimized page, plugins to help along the way, and other tips for using WordPress to maximize your SEO efforts.
More details can be found here: http://www.webmechanix.com/wordpress-seo-wordcamp-2014
Wordcamp, India 2009 - How to Implement SEO on a Wordpress Blog - Wordpress S...Abhinav Gulyani
Abhinav Gulyani aka Aby presents at India's First Wordcamp - On implementation of SEO on Wordpress Blog / Website. He also talks about Social Media Marketing, Microblogging, On Page SEO & Off Page SEO Wordpress Plugins, Wordpress SEO Tips.
GTM Clowns, fun and hacks - Search Elite - May 2017 Gerry WhiteGerry White
As Google becomes a JavaScript crawler, GTM becomes an incredible way to improve your site for both users and bots. This goes through some very simple methods, and what they can be used for...
Css Founder is Website Designing Company working with the mission of Website For Everyone Website Start From 999/-* More Packages are available. we are best company in website designing company in Delhi, as we are also working in Website Designing company in Mumbai.
Session presented in the european DrupalCon Dublin 2016. Video can be found here: https://www.youtube.com/watch?v=152J_74KGl0
It's been 6 years since the term Responsive Web Design (RWD) was coined and today is difficult to see new projects without implementing it. But this time has allowed us to see the implementation can be even more important than the technique and the theory. The RWD covers from the performance to the implementation of patterns and "standard" behaviors to improve usability.
In this session I reviewed tools, techniques and concepts to improve our projects:
⁃ Modern Design processes
⁃ Performance
⁃ CSS structuring and optimization (CSS Methodologies and Living Styleguides)
⁃ Fixed-pixel vs relative units (and Viewport Sized Units)
⁃ Responsive Typography and FOUT, FOIT
⁃ Images, Responsive images and SVGs
⁃ Asynchronous loading
⁃ Proxy-based browsers
⁃ Beyond the Mouse
⁃ RWD patterns and Progressively Disclosure
I showed simulations for a better understanding.
This session was aimed to anyone who wanted to improve his RWD knowledge, although a minimal RWD knowledge was expected.
Accessibility is important for anyone with a presence on the web. Here are five simple things you can do to make your web pages more accessible.
These are the slides from a talk given at WordCamp Buffalo on May 5, 2018.
We can pretend that we’re helping others by making websites and software accessible, but we are really making them better for our future selves. Learn some fundamentals of accessibility and how it can benefit you (whether future you from ageing or you after something else limits your abilities).
We’ll review simple testing techniques, basic features and enhancements, coming trends, and where to get help. This is an overall primer for those who aren’t sure where to start nor how it helps them.
Web accessibility refers to the inclusive practice of removing barriers that prevent interaction with, or access to, websites by people with disabilities. When your website is inaccessible, research shows you could be excluding up to 20 percent of your visitors from interacting with your content and functionality. If your university website is inaccessible, you could be preventing access to education, student services, and more.
When your website is accessible, everyone can consume your information freely. Visually-impaired users can visit your website using a screen reader. Those who can’t use a mouse can navigate your site using a keyboard or other input device.
While creating accessible websites involves every step, including design and content, the foundation for good accessibility starts with good markup. Join my workshop to learn more about accessibility and how to program a high-quality user experience that is inclusive and beneficial to all.
We can all pretend that we’re helping others by making web sites and software accessible, but we are really making them better for our future selves. Learn some fundamentals of accessibility and how it can benefit you (whether future you from aging or you after something else limits your abilities). We’ll review simple testing techniques, basic features and enhancements, coming trends, and where to get help. This isn’t intended to be a deep dive, but more of an overall primer for those who aren’t sure where to start nor how it helps them.
Making Your Site Printable: CSS Summit 2014Adrian Roselli
The push for responsive web design has helped web developers consider how the sites they develop can adapt to different devices, including sizes, screen resolutions, and even contexts.
It should now be easier than ever to respond to a format that has existed since the start of the web -- print.
I'll walk through the process for making your responsive sites respond to the format we most often forget and show you how to use Google Analytics to track what pages are printed from your site.
We can all pretend that we’re helping others by making web sites and software accessible, but we are really making them better for our future selves. Learn some fundamentals of accessibility and how it can benefit you (whether future you from aging or you after something else limits your abilities). We’ll review simple testing techniques, basic features and enhancements, coming trends, and where to get help. This isn’t intended to be a deep dive, but more of an overall primer for those who aren’t sure where to start nor how it helps them.
Tips and tricks for the best user-friendly website ESRI Bulgaria
This presentation gives you some tips and tricks for making the best user-friendly website.
1. Mobile compatibility
2. Accessible to ALL Users
3. Well planned information architecture
4. Well-formatted content that is easy to scan
5. Spell check and broken links
6. Effective navigation
7. SEO and optimization
8. Usable forms
9. Good error handling
10. Fast load times
11. Browser consistency
12. Valid Markup & Clean Code
13. Contrasting color scheme
Follow this tips and you will have a great website
SEO Training Course Online, Learn SEO, SEO for Beginners, Complete SEO TutorialDeep Mehta
This is a complete training module on SEO. Learn about SEO from the basics to advanced stages using this presentation. This SEO training course will help you to keep up to speed with the most widely used digital marketing technique - Search Engine Optimization. This SEO course is published online for beginners as well as experts.
We can pretend that we’re helping others by making websites and software accessible, but we are really making them better for our future selves. Learn some fundamentals of accessibility and how it can benefit you (whether future you from ageing or you after something else limits your abilities).
We’ll review simple testing techniques, basic features and enhancements, coming trends, and where to get help. This is an overall primer for those who aren’t sure where to start nor how it helps them.
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Gen Z and the marketplaces - let's translate their needsLaura Szabó
The product workshop focused on exploring the requirements of Generation Z in relation to marketplace dynamics. We delved into their specific needs, examined the specifics in their shopping preferences, and analyzed their preferred methods for accessing information and making purchases within a marketplace. Through the study of real-life cases , we tried to gain valuable insights into enhancing the marketplace experience for Generation Z.
The workshop was held on the DMA Conference in Vienna June 2024.
Bridging the Digital Gap Brad Spiegel Macon, GA Initiative.pptxBrad Spiegel Macon GA
Brad Spiegel Macon GA’s journey exemplifies the profound impact that one individual can have on their community. Through his unwavering dedication to digital inclusion, he’s not only bridging the gap in Macon but also setting an example for others to follow.
Instagram has become one of the most popular social media platforms, allowing people to share photos, videos, and stories with their followers. Sometimes, though, you might want to view someone's story without them knowing.
Meet up Milano 14 _ Axpo Italia_ Migration from Mule3 (On-prem) to.pdfFlorence Consulting
Quattordicesimo Meetup di Milano, tenutosi a Milano il 23 Maggio 2024 dalle ore 17:00 alle ore 18:30 in presenza e da remoto.
Abbiamo parlato di come Axpo Italia S.p.A. ha ridotto il technical debt migrando le proprie APIs da Mule 3.9 a Mule 4.4 passando anche da on-premises a CloudHub 1.0.
Understanding User Behavior with Google Analytics.pdfSEO Article Boost
Unlocking the full potential of Google Analytics is crucial for understanding and optimizing your website’s performance. This guide dives deep into the essential aspects of Google Analytics, from analyzing traffic sources to understanding user demographics and tracking user engagement.
Traffic Sources Analysis:
Discover where your website traffic originates. By examining the Acquisition section, you can identify whether visitors come from organic search, paid campaigns, direct visits, social media, or referral links. This knowledge helps in refining marketing strategies and optimizing resource allocation.
User Demographics Insights:
Gain a comprehensive view of your audience by exploring demographic data in the Audience section. Understand age, gender, and interests to tailor your marketing strategies effectively. Leverage this information to create personalized content and improve user engagement and conversion rates.
Tracking User Engagement:
Learn how to measure user interaction with your site through key metrics like bounce rate, average session duration, and pages per session. Enhance user experience by analyzing engagement metrics and implementing strategies to keep visitors engaged.
Conversion Rate Optimization:
Understand the importance of conversion rates and how to track them using Google Analytics. Set up Goals, analyze conversion funnels, segment your audience, and employ A/B testing to optimize your website for higher conversions. Utilize ecommerce tracking and multi-channel funnels for a detailed view of your sales performance and marketing channel contributions.
Custom Reports and Dashboards:
Create custom reports and dashboards to visualize and interpret data relevant to your business goals. Use advanced filters, segments, and visualization options to gain deeper insights. Incorporate custom dimensions and metrics for tailored data analysis. Integrate external data sources to enrich your analytics and make well-informed decisions.
This guide is designed to help you harness the power of Google Analytics for making data-driven decisions that enhance website performance and achieve your digital marketing objectives. Whether you are looking to improve SEO, refine your social media strategy, or boost conversion rates, understanding and utilizing Google Analytics is essential for your success.
APNIC Foundation, presented by Ellisha Heppner at the PNG DNS Forum 2024APNIC
Ellisha Heppner, Grant Management Lead, presented an update on APNIC Foundation to the PNG DNS Forum held from 6 to 10 May, 2024 in Port Moresby, Papua New Guinea.
1. coachesoftechnology.com
WEBSITE ACCESSIBILITY
5 WAYS TO IMPROVE ACCESSIBILITY
TREVOR JOHNSON-STEIGELMAN
Over 15 million U.S. Internet users have some form of impairment that affects their
ability to use the Internet.
In this talk, we will share some simple ways to improve your site’s accessibility.
These changes help everyone. As an extra bonus, accessibility improves your search
engine optimization (SEO).
By the end of this talk, you will be able…
1. To understand why accessibility is helpful for everyone.
2. To help make your website better for the visually impaired.
3. To help make your website better for the hearing impaired.
4. To help make your website better for the mobility impaired.
5. To improve your website SEO.
Coaches of
Technology
coachesoftech.com
4. WHY WORRY ABOUT ACCESSIBILITY?
There are lots of us who have some
type of disability…
• 8.2% - hand mobility
• 3.3% - vision impairment
• 3.1% - hearing impairment
About 15.5 million users
This doesn’t count the temporarily
impaired.
Those who don’t have impairments
still use mobile devices.
5. WHY WORRY ABOUT ACCESSIBILITY?
Unselfish Reasons
Make things a bit easier
for everyone.
Be nice to people.
Selfish Reasons
Sell more Stuff
• More customers
Avoid Legal Issues (ADA)
Search Engine Optimization
8. TAG: YOU’RE IT.
• Heading Tags aren’t just for formatting.
• THESE GIVE STRUCTURE TO THE PAGE.
Context and priority Semantic MEANING
• Tagging is useful for…
COGNITIVELY IMPAIRED
• Visually impaired
• Screen Readers
• Keyboard movement
9. <H1>TAG: YOU’RE IT.</H1>
<h2> Heading Tags aren’t just for formatting. </h2>
<h2>These give structure to the page. </h2>
<h3>Context and priority </h3>
<h2>Tagging is useful for… </h3>
<h3>Cognitively impaired </h3>
<h3>Visually impaired </h3>
<h3>Screen Readers </h3>
<h3>Keyboard movement </h3>
10. <H1>TAG: YOU’RE IT.</H1>
<h2> Heading Tags aren’t just for formatting. </h2>
<h2>These give structure to the page. </h2>
• <h3>Context and priority </h3>
• <h3>Semantic Meaning </h3>
<h2>Tagging is useful for… </h3>
• <h3>Cognitively impaired </h3>
• <h3>Visually impaired </h3>
• <h3>Screen Readers </h3>
• <h3>Keyboard movement </h3>
11. TAG: YOU’RE IT.
Heading Tags aren’t just for formatting.
These give structure to the page.
• Context and priority
• Semantic Meaning
Tagging is useful for…
• Cognitively impaired
• Visually impaired
• Screen Readers
• Keyboard movement
12. <h1>Accessibility</h1>
SEMANTIC MEANING – THINK ABOUT AN OUTLINE
I. Accessibility
<h2>Tags </h2>
<h3>Heading Tags </h3>
<h3>Styles</h3>
<h4><em></h4>
<h4><strong></h4>
<h2>Colors </h2>
<h3>Color Impairment </h3>
<h3>Contrast </h3>
<h3>Color and Meaning</h3>
A. Tags
1. Heading Tags
2. Styles
a) <em>
b) <strong>
B. Colors
1. Color Impairment
2. Contrast
3. Color and Meaning
13. USING TAGS APPROPRIATELY
Use CSS in your child theme
• This gives consistency across the site.
Use header tags <h1>, <h2>, etc. for structure.
• Don’t skip tags.
Use phrase tags for semantic meaning.
• <em> - emphasized text
• <strong> - important text
• <code> - computer code
• <samp> - computer output
• <kbd> - keyboard input
• <var> - variable
19. Provide sufficient contrast.
Specify both foreground
and background.
Be careful of background
gradients and color
combinations.
Be careful of background
images.
Contrast
Contrast
Contrast
Contrast
22. TIPS:
• Make sure that color isn’t the only
way to give meaning.
• Errors, selections, etc.
-2.0
-1.0
0.0
1.0
2.0
0 1 2 3
Disp.(cm)
Time (s)
-2.0
-1.0
0.0
1.0
2.0
0 1 2 3
Disp.(cm)
Time (s)
https://www.webaccessibility.com/best_practices.php
Expressive Traffic Lights
by Pascal Terjan
23. LINKS
Avoid using Long URLS directly as links
• https://www.physicsthisweek.com/topic/magnitude-and-direction/
Use informative link structure in your pages.
Color and Underline
• Underline so that links are visible to all.
• Use blue for unfollowed links.
• Use purple for followed links.
Use Anchor Text.
<a href = “https://www.physicsthisweek.com/topic/magnitude”>Magnitude<a>
24. LINKS AND SCREEN READERS
Most browsers use Tab to move between links.
Screen readers say “Link” before each link.
Links out of context – use Anchor Text.
Here is an article about using links properly.
For more information about links, click here.
For more information about links, click here.
List Main point first, extra info later
• Products (opens in new window)
• Link opens in new window: Products
Be careful and concise in your wording
• “Contact Us” vs. “In order to Contact us”
• “About” vs. “To learn more about our company”
25. WHY USE ALTERNATIVE TEXT
Alternative Text is
• a description
• and/or context
http://www.wpbeginner.com/beginners-guide/image-alt-text-vs-image-title-in-wordpress-whats-the-difference/
<img
src=http://www.publicdomainpictures.net/pictures/230
000/velka/albert-einstein-oil-painting-
1505932842nN3.jpg
alt="Albert Einstein, Oil Painting" id="image"
itemprop="image">
Alternative text can be
• part of the alt= attribute
• or present elsewhere in the text.
Albert Einstein, Oil Painting
26.
27. ALT TEXT
Sometimes referred to as “alt tag”
alt attribute in <img> tag
Read by screen readers
Appears on mouse-over.
Replaces missing image.
CAPTIONS
Displayed for Everyone
DESCRIPTION
Shows up on attachment page
SEO related, not accessibility
28. ALT TAG TIPS
Avoid redundancy
Don’t re-copy text that is already there.
Don’t include “Image of…”
Sometimes alt =“” is okay.
• All info is there.
Links
Image-only links must have an alt attribute.
33. BENEFITS
Benefits for Everyone
• Confusing words are spelled out.
• Video can be watched while other noise is present.
• Video can be watched without bothering others.
Benefits for Your Website
• Posted transcript contains keywords for search.
• You can adapt transcript for blog posts.
34. PICKING GOOD FONTS: THE OLD SCHOOL METHOD
Screens
Sans Serif Fonts
Helvetica
Tahoma
Verdana
Print
Serif Fonts
Times New Roman
Georgia
Book Antiqua
35. THESE FONTS ARE ALL SIZED AT 36PT.
I will not use Curlz MT font on my webpages.
I will not use Forte font on my webpages.
I will not use Gigi font on my webpages.
I will not use Jokerman font on my webpages.
I willnot useNiagaraEngravedfont on mywebpages.
I will not use Palace Script font on my webpages.
I will not use Vivaldi font on my webpages. Blackboard Chalk
by raindart is licensed
under CC BY-SA
38. ARIA – ACCESSIBLE RICH INTERNET APPLICATIONS
Tags common parts of a web page.
https://www.w3.org/TR/wai-aria-practices/examples/landmarks/banner.html
50. POSSIBLE CITATIONS (NOT ALL CITATIONS USED IN EVERY LECTURE)
H. E. White and D. H. White, Physics and Music: The Science of Musical Sound
(Dover Publications, Mineola, NY, 2014) (Original work published 1980) pp. XXX
OpenStax, College Physics. OpenStax CNX. Sep 27, 2017
http://cnx.org/contents/031da8d3-b525-429c-80cf-6c8ed997733a@9.95
OpenStax University Physics, University Physics Volume 1. OpenStax CNX. Sep 29, 2017
http://cnx.org/contents/d50f6e32-0fda-46ef-a362-9bd36ca7c97d@6.1
OpenStax University Physics, University Physics Volume 2. OpenStax CNX. Sep 29, 2017
http://cnx.org/contents/7a0f9770-1c44-4acd-9920-1cd9a99f2a1e@4.1
OpenStax University Physics, University Physics Volume 3. OpenStax CNX. Sep 29, 2017
http://cnx.org/contents/af275420-6050-4707-995c-57b9cc13c358@5.1