APA (7th ed.) Citation

Christopherson, R. W. (2009). Geosystems: An introduction to physical geography (7th ed., custom ed.). Pearson Custom Pub.

Chicago Style (17th ed.) Citation

Christopherson, Robert W. Geosystems: An Introduction to Physical Geography. 7th ed., custom ed. New York: Pearson Custom Pub, 2009.

MLA (9th ed.) Citation

Christopherson, Robert W. Geosystems: An Introduction to Physical Geography. 7th ed., custom ed. Pearson Custom Pub, 2009.