APA (7th ed.) Citation

Hess, U., & Thibault, P. (2009). Darwin and Emotion Expression. American Psychologist, 64(2), 120. https://doi.org/10.1037/a0013386

Chicago Style (17th ed.) Citation

Hess, Ursula, and Pascal Thibault. "Darwin and Emotion Expression." American Psychologist 64, no. 2 (2009): 120. https://doi.org/10.1037/a0013386.

MLA (9th ed.) Citation

Hess, Ursula, and Pascal Thibault. "Darwin and Emotion Expression." American Psychologist, vol. 64, no. 2, 2009, p. 120, https://doi.org/10.1037/a0013386.