Παραπομπή APA

Levin, H. L. (2013). The earth through time / Harold L. Levin (10th ed.). John Wiley & Sons.

Παραπομπή Chicago Style

Levin, Harold L. The Earth Through Time / Harold L. Levin. 10th ed. Hoboken, N.J.: John Wiley & Sons, 2013.

Παραπομπή MLA

Levin, Harold L. The Earth Through Time / Harold L. Levin. 10th ed. John Wiley & Sons, 2013.