Cita APA (7a ed.)

Singer, P. (1993). Practical ethics (2nd ed.). Cambridge University Press.

Cita Chicago Style (17a ed.)

Singer, Peter. Practical Ethics. 2nd ed. Cambridge: Cambridge University Press, 1993.

Cita MLA (9a ed.)

Singer, Peter. Practical Ethics. 2nd ed. Cambridge University Press, 1993.