Παραπομπή APA

Christopherson, R. W., & Hobbs, G. L. (1998). Applied physical geography: Geosystems in the laboratory (2nd ed.). Prentice-Hall of India.

Παραπομπή Chicago Style

Christopherson, Robert W., και Gail Lewis Hobbs. Applied Physical Geography: Geosystems in the Laboratory. 2nd ed. London: Prentice-Hall of India, 1998.

Παραπομπή MLA

Christopherson, Robert W., και Gail Lewis Hobbs. Applied Physical Geography: Geosystems in the Laboratory. 2nd ed. Prentice-Hall of India, 1998.