APA (7th ed.) Citation

Hurlbut, J. (1991). Gemology (2nd ed.). John Wiley and Sons.

Chicago Style (17th ed.) Citation

Hurlbut, Jr. Gemology. 2nd ed. New York: John Wiley and Sons, 1991.

MLA (9th ed.) Citation

Hurlbut, Jr. Gemology. 2nd ed. John Wiley and Sons, 1991.