APA (7 वां संस्करण) प्रशस्ति पत्र

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

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

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

एमएलए (9वां संस्करण) प्रशस्ति पत्र

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