APA (7th ed.) Citation

Waterloo, S. (2005). The Story of Ab: A Tale of the Time of the Cave Man. Project Gutenberg.

Chicago Style (17th ed.) Citation

Waterloo, Stanley. The Story of Ab: A Tale of the Time of the Cave Man. Project Gutenberg, 2005.

MLA (9th ed.) Citation

Waterloo, Stanley. The Story of Ab: A Tale of the Time of the Cave Man. Project Gutenberg, 2005.

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