APA Edition Citation

Hurlbut, C. S. J., & Switzer, G. S. (1979). Gemology. John Wiley.

Chicago Edition Citation

Hurlbut, Cornelius S. Jr, and George S. Switzer. Gemology. New York: John Wiley, 1979.

MLA Edition Citation

Hurlbut, Cornelius S. Jr, and George S. Switzer. Gemology. John Wiley, 1979.