Encyclopedias

Children's Britannica. Chicago: Encyclopedia Britannica, Inc., 1988.

Encyclopedia Americana. New York: American Corp., 1966.

Microsoft Encarta 99 Encyclopedia. CD-ROM. Redmond, WA: Microsoft Corporation, 1993-1998.

The New Book of Knowledge. New York: Grolier, Incorporated, 1966.

The World Book Encyclopedia. Chicago: World Book, Inc., 1993.

World Book Millennium 2000. CD-ROM. Redmond, WA: World Book, Inc,. 1999.