APA (7th ed.) Citation

Clifton, M. (2008). Eight Keys to Eden. Project Gutenberg.

Chicago Style (17th ed.) Citation

Clifton, Mark. Eight Keys to Eden. Project Gutenberg, 2008.

MLA (9th ed.) Citation

Clifton, Mark. Eight Keys to Eden. Project Gutenberg, 2008.

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