APA (7th ed.) Citation

Huxley, L. (2005). Thomas Henry Huxley: A Character Sketch. Project Gutenberg.

Chicago Style (17th ed.) Citation

Huxley, Leonard. Thomas Henry Huxley: A Character Sketch. Project Gutenberg, 2005.

MLA (9th ed.) Citation

Huxley, Leonard. Thomas Henry Huxley: A Character Sketch. Project Gutenberg, 2005.

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