APA (7th ed.) Citation

Huxley, T. H. (2001). The Darwinian Hypothesis. Project Gutenberg.

Chicago Style (17th ed.) Citation

Huxley, Thomas Henry. The Darwinian Hypothesis. Project Gutenberg, 2001.

MLA (9th ed.) Citation

Huxley, Thomas Henry. The Darwinian Hypothesis. Project Gutenberg, 2001.

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