General Reference Sources:

• Bartleby.com Reference
  www.bartleby.com/reference/
• Martindale's "The Reference Desk"
  www.martindalecenter.com/
• Virtual Reference Shelf (U.S. Library of Congress)
  www.loc.gov/rr/askalib/virtualref.html

Almanacs:

• Information Please
  www.infoplease.com/
• Old Farmer's Almanac
  www.almanac.com/

Encyclopedias:

• Access Science: The Online Encyclopedia of Science and Technology
• Brewer's Dictionary of Phrase & Fable
  www.bartleby.com/81/
• Canadian Encyclopedia Online
  thecanadianencyclopedia.com/
• Columbia Encyclopedia
  www.bartleby.com/65/
• Encyclopedia.com
  www.encyclopedia.com/
• How Stuff Works
  www.howstuffworks.com/

Quotations:

• Bartlett's Familiar Quotations
  www.bartleby.com/100/
• Creative Quotations
  www.creativequotations.com/
• Simpson's Contemporary Quotations (1950-1988) via Bartleby.com
  www.bartleby.com/63/