APA (7th ed.) Citation

Marlowe, S. (2010). Think Yourself to Death. Project Gutenberg.

Chicago Style (17th ed.) Citation

Marlowe, Stephen. Think Yourself to Death. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Marlowe, Stephen. Think Yourself to Death. Project Gutenberg, 2010.

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