APA (7th ed.) Citation

Darwin, C. R., & Ekman, P. (1998). The expression of the emotions in man and animals (3rd ed.). HarperCollins.

Chicago Style (17th ed.) Citation

Darwin, Charles Robert, and Paul Ekman. The Expression of the Emotions in Man and Animals. 3rd ed. London: HarperCollins, 1998.

MLA (9th ed.) Citation

Darwin, Charles Robert, and Paul Ekman. The Expression of the Emotions in Man and Animals. 3rd ed. HarperCollins, 1998.