Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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