Style de citation APA (7e éd.)

LEVIN, H. L. (1983). The earth through time.-- ed.2. Saunders College.

Style de citation Chicago (17e éd.)

LEVIN, Harold L. The Earth Through Time.-- Ed.2. New York: Saunders College, 1983.

Style de citation MLA (9e éd.)

LEVIN, Harold L. The Earth Through Time.-- Ed.2. Saunders College, 1983.