APA (7th ed.) Citation

Galen & Brock, A. J. (2013). On the Natural Faculties. Project Gutenberg.

Chicago Style (17th ed.) Citation

Galen and Arthur John Brock. On the Natural Faculties. Project Gutenberg, 2013.

MLA (9th ed.) Citation

Galen and Arthur John Brock. On the Natural Faculties. Project Gutenberg, 2013.

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