APA (7th ed.) Citation

Singer, P. (1981). The expanding circle : ethics and sociobiology / Peter Singer: Ethics and sociobiology. Clarendon Press.

Chicago Style (17th ed.) Citation

Singer, Peter. The Expanding Circle : Ethics and Sociobiology / Peter Singer: Ethics and Sociobiology. Oxford: Clarendon Press, 1981.

MLA (9th ed.) Citation

Singer, Peter. The Expanding Circle : Ethics and Sociobiology / Peter Singer: Ethics and Sociobiology. Clarendon Press, 1981.

Warning: These citations may not always be 100% accurate.