APA (7th ed.) Citation

Ruse, M., & Richards, R. J. (2009). The Cambridge companion to the "Origin of species". Cambridge University Press.

Chicago Style (17th ed.) Citation

Ruse, Michael, and Robert J. Richards. The Cambridge Companion to the "Origin of Species". Cambridge ; New York: Cambridge University Press, 2009.

MLA (9th ed.) Citation

Ruse, Michael, and Robert J. Richards. The Cambridge Companion to the "Origin of Species". Cambridge University Press, 2009.