Cita APA (7a ed.)

Slawson, C. B., & Kraus, E. H. (1947). Gems and gem materials. McGraw-Hill Book Co..

Cita Chicago Style (17a ed.)

Slawson, Chester Baker, y E. H. Kraus. Gems and Gem Materials. New York: McGraw-Hill Book Co., 1947.

Cita MLA (9a ed.)

Slawson, Chester Baker, y E. H. Kraus. Gems and Gem Materials. McGraw-Hill Book Co., 1947.