APA (7th ed.) Citation

Firsoff, V. A., & Firsoff, G. I. (1975). The rockhound's handbook. Arco Pub. Co..

Chicago Style (17th ed.) Citation

Firsoff, V. A., and G. I. Firsoff. The Rockhound's Handbook. New York: Arco Pub. Co., 1975.

MLA (9th ed.) Citation

Firsoff, V. A., and G. I. Firsoff. The Rockhound's Handbook. Arco Pub. Co., 1975.