Reference


 * ** Encyclopedia / Reference **
 * [|World Book] [|Online]
 * [|Grolier Online]
 * [|World Almanac Encyclopedia]
 * [|CultureGrams]
 * [|Oxford Reference Center]
 * [|Funk and Wagnall's]
 * [|Encyclopedia of Life]

See also: media type="custom" key="5920175" || media type="custom" key="3900149"media type="custom" key="4353173"media type="custom" key="3905159"media type="custom" key="3905147" media type="custom" key="3905151" media type="custom" key="6968501" ||
 * [|iTools]
 * [|Government reference]
 * [|Refdesk.com]
 * [|Answers.com]