APA (7th ed.) Citation

Spencer, H., & Peel, J. D. Y. (1972). On social evolution: Selected writings. University of Chicago Press.

Chicago Style (17th ed.) Citation

Spencer, Herbert, and J. D. Y. Peel. On Social Evolution: Selected Writings. Chicago: University of Chicago Press, 1972.

MLA (9th ed.) Citation

Spencer, Herbert, and J. D. Y. Peel. On Social Evolution: Selected Writings. University of Chicago Press, 1972.