APA (7e ed.) Bronvermelding

Christopherson, R. W. (1998). Applied physical geography. Prentice Hall.

Chicago (17e ed.) Bronvermelding

Christopherson, Robert W. Applied Physical Geography. Upper Saddle River, New Jersey: Prentice Hall, 1998.

MLA (9e ed.) Bronvermelding

Christopherson, Robert W. Applied Physical Geography. Prentice Hall, 1998.