APA-referens (7:e uppl.)

TREWARTHA, G. T., ROBINSON, A. H., & HAMMOND, E. H. (1967). Elements of geography: Physical and culture.-- ed.5. McGraw-Hill Book co.

Chicago-referens (17:e uppl.)

TREWARTHA, Glenn T., Arthur H. ROBINSON, och Edwin H. HAMMOND. Elements of Geography: Physical and Culture.-- Ed.5. New York: McGraw-Hill Book co, 1967.

MLA-referens (9:e uppl.)

TREWARTHA, Glenn T., et al. Elements of Geography: Physical and Culture.-- Ed.5. McGraw-Hill Book co, 1967.