Dyfyniad APA

Christopherson, R. W. (2003). Geosystems: An introduction to physical geography (5th ed.). Upper Saddle River, N.J.: Prentice Hall.

Dyfyniad Arddull Chicago

Christopherson, Robert W. Geosystems: An Introduction to Physical Geography. 5th ed. Upper Saddle River, N.J.: Prentice Hall, 2003.

Dyfyniad MLA

Christopherson, Robert W. Geosystems: An Introduction to Physical Geography. 5th ed. Upper Saddle River, N.J.: Prentice Hall, 2003.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.