Dyfyniad APA

Singer, P. (1991). In defence of animals.

Dyfyniad Arddull Chicago

Singer, Peter. In Defence of Animals. Blackwell Publishers, Oxford, 1991.

Dyfyniad MLA

Singer, Peter. In Defence of Animals. 1991.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.