Tudge, C. (1996). The time before history: 5 million years of human impact. Scribner.
Cita Chicago Style (17a ed.)Tudge, Colin. The Time Before History: 5 Million Years of Human Impact. New York: Scribner, 1996.
Cita MLA (8a ed.)Tudge, Colin. The Time Before History: 5 Million Years of Human Impact. Scribner, 1996.
Precaución: Estas citas no son 100% exactas.