APA (7th ed.) Citation

Romanes, G. J., & Darwin, C. (1885). Mental evolution in animals. Kegan Paul, Trench.

Chicago Style (17th ed.) Citation

Romanes, George John, and Charles Darwin. Mental Evolution in Animals. London: Kegan Paul, Trench, 1885.

MLA (8th ed.) Citation

Romanes, George John, and Charles Darwin. Mental Evolution in Animals. Kegan Paul, Trench, 1885.