APA (7th ed.) Citation

Sinclair, U. (2005). The Profits of Religion, Fifth Edition. Project Gutenberg.

Chicago Style (17th ed.) Citation

Sinclair, Upton. The Profits of Religion, Fifth Edition. Project Gutenberg, 2005.

MLA (9th ed.) Citation

Sinclair, Upton. The Profits of Religion, Fifth Edition. Project Gutenberg, 2005.

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