Gaya APA

Twist, C. (1997). Encyclopedia of Science 4 Life On Earth : Fossil and Human Ancestors - The Basics of Life . New York: Macmillan.

Gaya MLA

Twist, Clint. "Encyclopedia of Science 4 Life On Earth : Fossil and Human Ancestors - The Basics of Life". New York: Macmillan, 1997. Text.