Cita APA (7a ed.)
Christopherson, R. W. (1994). Geosystems: An introduction to physical Geography (2nd ed.). Macmillan.
Cita Chicago Style (17a ed.)
Christopherson, Robert W. Geosystems: An Introduction to Physical Geography. 2nd ed. Englewood Cliffs: Macmillan, 1994.
Cita MLA (9a ed.)
Christopherson, Robert W. Geosystems: An Introduction to Physical Geography. 2nd ed. Macmillan, 1994.
Precaución: Estas citas no son 100% exactas.