APA (7th ed.) Citation

Day, C. (2004). This Simian World. Project Gutenberg.

Chicago Style (17th ed.) Citation

Day, Clarence. This Simian World. Project Gutenberg, 2004.

MLA (9th ed.) Citation

Day, Clarence. This Simian World. Project Gutenberg, 2004.

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