Cita APA (7th ed.)

Levin, H. L. (2003). The earth through time (7th ed.). J. Wiley.

Cita Chicago (17th ed.)

Levin, Harold L. The Earth Through Time. 7th ed. Hoboken, NJ: J. Wiley, 2003.

Cita MLA (9th ed.)

Levin, Harold L. The Earth Through Time. 7th ed. J. Wiley, 2003.