Christopherson, R. W. (2003). Geosystems: An introduction to physical geography (5th ed.). Upper Saddle River, N.J.: Prentice Hall.
Trích dẫn kiểu ChicagoChristopherson, Robert W. Geosystems: An Introduction to Physical Geography. 5th ed. Upper Saddle River, N.J.: Prentice Hall, 2003.
Deismireacht MLAChristopherson, Robert W. Geosystems: An Introduction to Physical Geography. 5th ed. Upper Saddle River, N.J.: Prentice Hall, 2003.
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