Cita APA (7th ed.)

Christopherson, R. W. (2012). Geosystems: An introduction to physical geography (Eigth edition.). Prentice Hall.

Cita Chicago (17th ed.)

Christopherson, Robert W. Geosystems: An Introduction to Physical Geography. Eigth edition. Upper Saddle River, New York: Prentice Hall, 2012.

Cita MLA (9th ed.)

Christopherson, Robert W. Geosystems: An Introduction to Physical Geography. Eigth edition. Prentice Hall, 2012.