APA (7th ed.) Citation

Smith, G. O., & Martinez. (2007). Instinct. Project Gutenberg.

Chicago Style (17th ed.) Citation

Smith, George O., and Martinez. Instinct. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Smith, George O., and Martinez. Instinct. Project Gutenberg, 2007.

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