APA (7th ed.) Citation

Christopherson, R. W. (1994). Geosystems: An introduction to physical geography (2nd ed.). Macmillan.

Chicago Style (17th ed.) Citation

Christopherson, Robert W. Geosystems: An Introduction to Physical Geography. 2nd ed. New York: Macmillan, 1994.

MLA (9th ed.) Citation

Christopherson, Robert W. Geosystems: An Introduction to Physical Geography. 2nd ed. Macmillan, 1994.