APA (7th ed.) Citation

Sturgis, M. (2010). The Unprotected Species. Project Gutenberg.

Chicago Style (17th ed.) Citation

Sturgis, Melvin. The Unprotected Species. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Sturgis, Melvin. The Unprotected Species. Project Gutenberg, 2010.

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