APA (7th ed.) Citation

Leakey R. Richard & Lewin R. Roger. (1999). The Sixth Extinction. Biodiversity and its Survival. London, Phoenix, 1999.

Chicago Style (17th ed.) Citation

Leakey R. Richard and Lewin R. Roger. The Sixth Extinction. Biodiversity and Its Survival. London, Phoenix, 1999, 1999.

MLA (9th ed.) Citation

Leakey R. Richard and Lewin R. Roger. The Sixth Extinction. Biodiversity and Its Survival. London, Phoenix, 1999, 1999.

Warning: These citations may not always be 100% accurate.