APA (7th ed.) Citation

Huxley, T. H. (2001). On the Relations of Man to the Lower Animals. Project Gutenberg.

Chicago Style (17th ed.) Citation

Huxley, Thomas Henry. On the Relations of Man to the Lower Animals. Project Gutenberg, 2001.

MLA (9th ed.) Citation

Huxley, Thomas Henry. On the Relations of Man to the Lower Animals. Project Gutenberg, 2001.

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