Cita APA (7a ed.)

Conrad, J., & O'Prey, P. (1989). Heart of darkness. Penguin.

Cita Chicago Style (17a ed.)

Conrad, Joseph, y Paul O'Prey. Heart of Darkness. London [etc.]: Penguin, 1989.

Cita MLA (9a ed.)

Conrad, Joseph, y Paul O'Prey. Heart of Darkness. Penguin, 1989.