APA (7th ed.) Citation

Keane, A. H., Quiggin, A. H., & Haddon, A. C. (2011). Man, Past and Present. Project Gutenberg.

Chicago Style (17th ed.) Citation

Keane, A. H., A. Hingston Quiggin, and Alfred C. Haddon. Man, Past and Present. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Keane, A. H., et al. Man, Past and Present. Project Gutenberg, 2011.

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