APA (7th ed.) Citation

Mastin, J. (2007). The Chemistry, Properties and Tests of Precious Stones. Project Gutenberg.

Chicago Style (17th ed.) Citation

Mastin, John. The Chemistry, Properties and Tests of Precious Stones. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Mastin, John. The Chemistry, Properties and Tests of Precious Stones. Project Gutenberg, 2007.

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