Cita APA (7a ed.)

Nowell-Smith, P. (1969). Ethics 5. Penguin books.

Cita Chicago Style (17a ed.)

Nowell-Smith, P.H. Ethics 5. Middlesex: Penguin books, 1969.

Cita MLA (9a ed.)

Nowell-Smith, P.H. Ethics 5. Penguin books, 1969.