Huxley, T. H., & Ruse, T. (2009). Evolution and ethics: Thomas Henry Huxley. Ed. and with a new introd. by Michael Ruse. Princeton Univ. Press.

Huxley, Thomas Henry, and Thomas Ruse. Evolution and Ethics: Thomas Henry Huxley. Ed. and with a New Introd. by Michael Ruse. Princeton, NJ [u.a.]: Princeton Univ. Press, 2009.

Huxley, Thomas Henry, and Thomas Ruse. Evolution and Ethics: Thomas Henry Huxley. Ed. and with a New Introd. by Michael Ruse. Princeton Univ. Press, 2009.