APA (7th ed.) Citation

Conrad, J., & Hampson, R. G. (1995). Heart of darkness ; with The Congo diary. Penguin Books.

Chicago Style (17th ed.) Citation

Conrad, Joseph, and Robert Gavin Hampson. Heart of Darkness ; with The Congo Diary. London: Penguin Books, 1995.

MLA (9th ed.) Citation

Conrad, Joseph, and Robert Gavin Hampson. Heart of Darkness ; with The Congo Diary. Penguin Books, 1995.