APA (7th ed.) Citation

Holden, M. (1991). The encyclopedia of gems and minerals. Facts on File.

Chicago Style (17th ed.) Citation

Holden, Martin. The Encyclopedia of Gems and Minerals. New York: Facts on File, 1991.

MLA (9th ed.) Citation

Holden, Martin. The Encyclopedia of Gems and Minerals. Facts on File, 1991.

Warning: These citations may not always be 100% accurate.