APA (7th ed.) Citation

Hirschfeld, G. (1957). An essay on mankind. Philosophical Library.

Chicago Style (17th ed.) Citation

Hirschfeld, Gerhard. An Essay on Mankind. New York: Philosophical Library, 1957.

MLA (9th ed.) Citation

Hirschfeld, Gerhard. An Essay on Mankind. Philosophical Library, 1957.

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