Cita APA (7a ed.)

Nowell-Smith, P. H. (1961). Ethics (1st published, repr.). Penguin.

Cita Chicago Style (17a ed.)

Nowell-Smith, P. H. Ethics. 1st published, repr. Baltimore [etc.]: Penguin, 1961.

Cita MLA (9a ed.)

Nowell-Smith, P. H. Ethics. 1st published, repr. Penguin, 1961.