• WikipediA
    • The Free Encyclopedia
  • Digital Library
    • Full-text Digital Library committed to accuracy, accessibility and usability, offering texts and corpora as lexical hypertexts
  • Reference Desk
    • Since 1995, free and family friendly. Refdesk indexes and reviews quality, credible, and current information-based sites and assists readers in navigating these sites.
  • emTech Resources
    • emerging Technologies. Over 15,000 resources organized by topics for teachers, students, and parents.
  • Cambridge general reference
    • University of Cambridge, Dept. of Genetics. This web site has been recognized by ISI Current Contents as being "important, high-quality material on the Web".
  • World eBook
    • is an index of hyperlinks to the finest online reference resources on the Internet.
  • AllRefer.com
    • Our mission is to be the Internet’s most trusted and extensive information resource for reference and educational content.