Christopherson, R. W. (1997). Geosystems: An introduction to physical geography (3rd ed.). Upper Saddle River, NJ.: Prentice-Hall.
Παραπομπή Chicago StyleChristopherson, Robert W. Geosystems: An Introduction to Physical Geography. 3rd ed. Upper Saddle River, NJ.: Prentice-Hall, 1997.
Παραπομπή MLAChristopherson, Robert W. Geosystems: An Introduction to Physical Geography. 3rd ed. Upper Saddle River, NJ.: Prentice-Hall, 1997.
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