Cita APA (7a ed.)

Leakey, R. E. (1994). The origin of humankind. BasicBooks.

Cita Chicago Style (17a ed.)

Leakey, Richard E. The Origin of Humankind. New York: BasicBooks, 1994.

Cita MLA (9a ed.)

Leakey, Richard E. The Origin of Humankind. BasicBooks, 1994.