2. INFORMATION SOURCES
• An information source is a source of information for
somebody, i.e. anything that might inform a person about
something or provide knowledge to somebody.
• Information sources may be observations, people,
speeches, documents, pictures etc.
3. DIVISIONS OF INFORMATION SOURCES
INFORMATION SOURCES
DOCUMENTARY NON-DOCUMENTARY
PRIMARY SECONDARY TERTIARY
FORMAL INFORMAL
4. INTERNET INFORMATION SOURCES
• SEARCH ENGINES
• E-AGGREGRATORS
• SUBJECT GATEWAYS
• MAILING LISTS
• DIRECTORIES
• DATABASES
• E-TUTORIALS
• ETD’S
• E-BOOKS
• SOFTWARES AVAILIABLE ON INTERNET
5. MAILING LISTS
•Also known as
Discussion
Forums
,discussion lists
6. MAILING LIST
MODERATED UNMODERATED
MODERATED MAILING LIST
• having moderator to filter ,approve or edit messages before distribution
• these lists are often professional in nature
UNMODERATED MAILING LIST
• no moderator is present to filter ,edit or approve messages or emails
• all emails/messages are distributed to all members of the list through email
automatically
7. SEARCH ENGINES
• A search engine is a software that searches through a database of
webpages for specific information.
• Search engines have very huge databases.
• There is no assurance of quality contents
Examples:-
• Google
• Yahoo
• Webcrawler
• Altavista
• Lycos
• bing
8. GOOGLE
It is one of the most used & popular search engine having many unique
features.
Major features are:-
• Google books : www.books.google.com
With Google Book Search, you can quickly search almost the full text of a book.
• Google Scholar :
Google Scholar helps you search and find academic papers, abstracts and other
scholarly sources – all with the speed and accuracy of Google search.
• Google translator :
It allows a user to change the text or website available in any language to the known
language. for changing the website language we have to provide the URL of the
website.
• Google images:
this feature of Google helps us to search any image. We just have to give the related
keyword for the image.
9. E-BOOKS/ONLINEbe viewed online Can be
• •E-books/online texts can BOOKSTORES
searchable by author, title, subject
• •Books are available in many formats such as PDF, DOC,
HTML.
• •Orders can placed for books through online bookstores
Examples
• www.amazon.com,
• www.altbookstore.com
• www.booksamillion.com
• www.abebooks.com
10. DIRECTORIES
• They are organized list of information sources on web.
• Arranged alphabetically or follow a classified listing.
• Allow to browse through them as well as searchable
• They are organized by IT experts.
• They are smaller than search engines.
• There are free as well as fee based directories available on
internet.
free based--- www.doaj.com
fee based---- www.ebrary.com
11. • It is a type of directory which lists the journals which are free of
cost.
• It is covering almost all subjects and many languages.
• URL :- http://www.doaj.org
• It is an online library of full texts of over 70,000 scholarly
eBooks
• It is commercial in nature
• URL :- www.ebrary.com
12. SUBJECT GATEWAYS
• They are organized list of information sources
• Resources in subject gateways are selected & organized
by subject experts
• Provide more relevant information or quality content than
subject directories & search engines.
• Databases are smaller than both search engines and
directories
13. E-AGGREGRATORS
• E- aggregrators are large publishing houses available
on the web and provide access to e-journals, databases
and books.
• They provide access to their own sources and the
sources collected from small publication houses.
• EXAMPLES:-
• emerald (www.emeraldinsight.com)
• science direct (www.sciencedirect.com)
• springer link(
• taylor and francis
• kluwer
14. EMERALD
• It is an E-aggregrator or E-publisher providing journals,
books.
• it is responsible for publication of quality contents in a
subject.
• It is commercial in nature.
• Allow to browse through them as well as searchable
• It provides full articles , abstracts in many formats i.e.
HTML,PDF.
• URL :- www.emeraldinsight.com
Key Concepts: Some sites will state at the bottom of the home page statements such as “Date of Creation: 6/1/99” or “Updated 7/7/99.” If dates are clearly stated in this way, you should be able to rely upon them. However, rely upon your context clues. Does the information provided cover recent changes or advances in your topic? If not, the information is probably outdated. Example: For example, if your topic is cloning and you located a web site that discusses cloning as if it had not taken place yet, you would know that the information was published before Dolly, Gene, and other famous cloning experiments were successfully completed.
