Reference Collections Online
Bartleby.com
Bartleby.com publishes thousands of free online classics of reference, literature
and nonfiction.
ipl2
ipl2 is the result of a merger of the Internet Public Library (IPL) and the Librarians' Internet Index (LII). Includes directories of online texts, newspapers, magazines, reference materials; plus special sections for youth and teens.
Yahoo! Reference
Features content from reference books produced by several companies.
Last updated: June 16, 2011