APA (7th ed.) Citation

Darwin, C., & Darwin, F. (1890). The Expression of the Emotions in Man and Animals (2nd ed.). Cambridge University Press. https://doi.org/10.1017/CBO9780511694110

Chicago Style (17th ed.) Citation

Darwin, Charles, and Francis Darwin. The Expression of the Emotions in Man and Animals. 2nd ed. Cambridge: Cambridge University Press, 1890. https://doi.org/10.1017/CBO9780511694110.

MLA (9th ed.) Citation

Darwin, Charles, and Francis Darwin. The Expression of the Emotions in Man and Animals. 2nd ed. Cambridge University Press, 1890. https://doi.org/10.1017/CBO9780511694110.