Cita APA (7a ed.)

Moore, G. E. (1971). Principia ethica (1st pbk. ed.). University Press.

Cita Chicago Style (17a ed.)

Moore, G. E. Principia Ethica. 1st pbk. ed. Cambridge: University Press, 1971.

Cita MLA (9a ed.)

Moore, G. E. Principia Ethica. 1st pbk. ed. University Press, 1971.