APA (7th ed.) Citation

McCabe, J. (1997). The Story of Evolution. Project Gutenberg.

Chicago Style (17th ed.) Citation

McCabe, Joseph. The Story of Evolution. Project Gutenberg, 1997.

MLA (9th ed.) Citation

McCabe, Joseph. The Story of Evolution. Project Gutenberg, 1997.

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