APA (7e ed.) Bronvermelding

Christopherson, R. W. (1995). Elemental geosystems: A foundation in physical geography. Prentice Hall.

Chicago (17e ed.) Bronvermelding

Christopherson, Robert W. Elemental Geosystems: A Foundation in Physical Geography. Englewood Cliffs, N.J.: Prentice Hall, 1995.

MLA (8e ed.) Bronvermelding

Christopherson, Robert W. Elemental Geosystems: A Foundation in Physical Geography. Prentice Hall, 1995.