Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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

Precaución: Estas citas no son 100% exactas.