Style de citation APA (7e éd.)

Singer, P. (2011). The Expanding Circle: Ethics, Evolution, and Moral Progress (1st Princeton University Press pbk ed.). Princeton University Press.

Style de citation Chicago (17e éd.)

Singer, Peter. The Expanding Circle: Ethics, Evolution, and Moral Progress. 1st Princeton University Press pbk ed. Princeton, NJ: Princeton University Press, 2011.

Style de citation MLA (8e éd.)

Singer, Peter. The Expanding Circle: Ethics, Evolution, and Moral Progress. 1st Princeton University Press pbk ed. Princeton University Press, 2011.