- World Book Encyclopedia
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Online version of the complete reference work along with dictionary, atlas, links, magazines, historical documents, audio, video, images, and 3D photographs. Requires free temporary registration with option to buy continued access.
Reference/Encyclopedias
 http://www.worldbookonline.com
- Wikipedia
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A free encyclopedia built collaboratively using Wiki software.
Reference/Encyclopedias
http://en.wikipedia.org
- Encyclopaedia Britannica
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Provides complete text of Encyclopaedia Britannica with search capabilities, related links, and multimedia enhancements.
Reference/Encyclopedias
http://www.eb.com
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"In the middle of difficulty lies opportunity." - Albert Einstein
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