Cita APA (7a ed.)

Johnson, O. A. (1966). Moral knowledge. Martinus Nijhoff.

Cita Chicago Style (17a ed.)

Johnson, Oliver A. Moral Knowledge. The Hague: Martinus Nijhoff, 1966.

Cita MLA (9a ed.)

Johnson, Oliver A. Moral Knowledge. Martinus Nijhoff, 1966.