Παραπομπή APA

De Blij, H. J., & Muller, P. O. (1993). Physical geography of the global environment. Wiley.

Παραπομπή Chicago Style

De Blij, Harm J., και Peter O. Muller. Physical Geography of the Global Environment. New York: Wiley, 1993.

Παραπομπή MLA

De Blij, Harm J., και Peter O. Muller. Physical Geography of the Global Environment. Wiley, 1993.