APA (7th ed.) Citation

Whalley, J. (2004). An introduction to gemmology.

Chicago Style (17th ed.) Citation

Whalley, Joanna. An Introduction to Gemmology. 2004.

MLA (9th ed.) Citation

Whalley, Joanna. An Introduction to Gemmology. 2004.

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