APA (7th ed.) Citation

Huxley, T. H. (2010). Essays Upon Some Controverted Questions. Project Gutenberg.

Chicago Style (17th ed.) Citation

Huxley, Thomas Henry. Essays Upon Some Controverted Questions. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Huxley, Thomas Henry. Essays Upon Some Controverted Questions. Project Gutenberg, 2010.

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