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
