Gruen, L. (2011). Ethics and animals: An introduction. Cambridge University Press.
Chicago Style aipamenaGruen, Lori. Ethics and Animals: An Introduction. Cambridge, UK ; New York: Cambridge University Press, 2011.
MLA aipamenaGruen, Lori. Ethics and Animals: An Introduction. Cambridge University Press, 2011.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.