APA (7e ed.) Bronvermelding

Darwin, C., Barrett, P. H., & Freeman, R. B. (1989). The expression of the emotions in man and animals. Pickering.

Chicago (17e ed.) Bronvermelding

Darwin, Charles, Paul H. Barrett, en R. B. Freeman. The Expression of the Emotions in Man and Animals. London: Pickering, 1989.

MLA (8e ed.) Bronvermelding

Darwin, Charles, et al. The Expression of the Emotions in Man and Animals. Pickering, 1989.