Cita APA (7a ed.)

Sidgwick, H., & Rawls, J. (1981). The methods of ethics. Hackett.

Cita Chicago Style (17a ed.)

Sidgwick, Henry, y John Rawls. The Methods of Ethics. Indianapolis [etc.]: Hackett, 1981.

Cita MLA (9a ed.)

Sidgwick, Henry, y John Rawls. The Methods of Ethics. Hackett, 1981.