APA (7th ed.) Citation

Darwin, C., Cain, J., & Messenger, S. (2009). The expression of the emotions in man and animals ([New] ed.). Penguin.

Chicago Style (17th ed.) Citation

Darwin, Charles, Joe Cain, and Sharon Messenger. The Expression of the Emotions in Man and Animals. [New] ed. London: Penguin, 2009.

MLA (8th ed.) Citation

Darwin, Charles, et al. The Expression of the Emotions in Man and Animals. [New] ed. Penguin, 2009.

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