APA (7th ed.) Citation

Switzer, C. S. H. a. G. S. Gemology. John Wiley and Sons.

Chicago Style (17th ed.) Citation

Switzer, Cornelius S. Hurlbut and George S. Gemology. John Wiley and Sons.

MLA (8th ed.) Citation

Switzer, Cornelius S. Hurlbut and George S. Gemology. John Wiley and Sons.

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