APA (7th ed.) Citation

Darwin, C., & Simpson, G. G. (1983). The book of Darwin. Washington Square Press.

Chicago Style (17th ed.) Citation

Darwin, Charles, and George Gaylord Simpson. The Book of Darwin. New York: Washington Square Press, 1983.

MLA (8th ed.) Citation

Darwin, Charles, and George Gaylord Simpson. The Book of Darwin. Washington Square Press, 1983.