Cita APA (7a ed.)

Prichard, H. A., & Urmson, J. O. (1971). Moral obligation: And duty and interest. Oxford University Press.

Cita Chicago Style (17a ed.)

Prichard, Harold Arthur, y James Opie Urmson. Moral Obligation: And Duty and Interest. London [etc.]: Oxford University Press, 1971.

Cita MLA (9a ed.)

Prichard, Harold Arthur, y James Opie Urmson. Moral Obligation: And Duty and Interest. Oxford University Press, 1971.