Gaya APA

Colbert, E, H., Morales, M. (1991). Evolution of The Vertebrates : A History of the Backboned Animals Through Time (4th ed.). New York: Wiley-Liss.

Gaya MLA

Colbert, Edwin, H.., Morales, Michael. "Evolution of The Vertebrates : A History of the Backboned Animals Through Time". 4th ed. New York: Wiley-Liss, 1991. Text.