APA (7th ed.) Citation

Conrad, J., & O'Prey, P. (1986). Heart of darkness: Joseph Conrad. Ed. with introduction by Paul O'Prey. Penguin Books.

Chicago Style (17th ed.) Citation

Conrad, Joseph, and Paul O'Prey. Heart of Darkness: Joseph Conrad. Ed. with Introduction by Paul O'Prey. Harmondsworth: Penguin Books, 1986.

MLA (8th ed.) Citation

Conrad, Joseph, and Paul O'Prey. Heart of Darkness: Joseph Conrad. Ed. with Introduction by Paul O'Prey. Penguin Books, 1986.