APA (7th ed.) Citation

Cornelius S Hurlbut Jr, G. S. S. (1979). Gemology. A Wiley Interscience.

Chicago Style (17th ed.) Citation

Cornelius S Hurlbut Jr, George S Switzer. Gemology. A Wiley Interscience, 1979.

MLA (8th ed.) Citation

Cornelius S Hurlbut Jr, George S Switzer. Gemology. A Wiley Interscience, 1979.

Warning: These citations may not always be 100% accurate.