Cita APA (7a ed.)

Cowley, C. (2015). Supererogation. Cambridge University Press.

Cita Chicago Style (17a ed.)

Cowley, Christopher. Supererogation. Cambridge [etc.]: Cambridge University Press, 2015.

Cita MLA (9a ed.)

Cowley, Christopher. Supererogation. Cambridge University Press, 2015.