APA (7e ed.) Bronvermelding

Trewartha, . G. T., Robinson, A. H., & Hammond, E. H. (1967). Elements of Geography (5th ed.). McGraw-Hill.

Chicago (17e ed.) Bronvermelding

Trewartha, Glenn T., Arthur H. Robinson, en Edwin H. Hammond. Elements of Geography. 5th ed. New York: McGraw-Hill, 1967.

MLA (9e ed.) Bronvermelding

Trewartha, Glenn T., et al. Elements of Geography. 5th ed. McGraw-Hill, 1967.