APA-referens (7:e uppl.)

Leakey, R. E., & Lewin, R. (1996). The sixth extinction: Biodiversity and its survival. Weidenfeld & Nicolson.

Chicago-referens (17:e uppl.)

Leakey, Richard E., och Roger Lewin. The Sixth Extinction: Biodiversity and Its Survival. London: Weidenfeld & Nicolson, 1996.

MLA-referens (9:e uppl.)

Leakey, Richard E., och Roger Lewin. The Sixth Extinction: Biodiversity and Its Survival. Weidenfeld & Nicolson, 1996.