Singer, P. (2011). Practical ethics (2nd. ed.). Cambridge University Press.
Dyfyniad Arddull ChicagoSinger, Peter. Practical Ethics. 2nd. ed. New York: Cambridge University Press, 2011.
Dyfyniad MLASinger, Peter. Practical Ethics. 2nd. ed. Cambridge University Press, 2011.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.