Cita APA (7th ed.)

Levin, H. L. (2006). The earth through time (8th ed.). Wiley.

Cita Chicago (17th ed.)

Levin, Harold L. The Earth Through Time. 8th ed. Hoboken, N.J: Wiley, 2006.

Cita MLA (9th ed.)

Levin, Harold L. The Earth Through Time. 8th ed. Wiley, 2006.