Dyfyniad APA

Singer, P. (2011). Practical ethics (2nd. ed.). Cambridge University Press.

Dyfyniad Arddull Chicago

Singer, Peter. Practical Ethics. 2nd. ed. New York: Cambridge University Press, 2011.

Dyfyniad MLA

Singer, Peter. Practical Ethics. 2nd. ed. Cambridge University Press, 2011.

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