APA (7th ed.) Citation

Huxley, T. H. (2003). Discourses: Biological and Geological Essays. Project Gutenberg.

Chicago Style (17th ed.) Citation

Huxley, Thomas Henry. Discourses: Biological and Geological Essays. Project Gutenberg, 2003.

MLA (9th ed.) Citation

Huxley, Thomas Henry. Discourses: Biological and Geological Essays. Project Gutenberg, 2003.

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