APA-referens (7:e uppl.)

Getis, A., Getis, J., & Fellmann, J. D. (2002). Introduction to geography (8th ed.). McGraw-Hill.

Chicago-referens (17:e uppl.)

Getis, Arthur, Judith Getis, och Jerome Donald Fellmann. Introduction to Geography. 8th ed. Boston: McGraw-Hill, 2002.

MLA-referens (9:e uppl.)

Getis, Arthur, et al. Introduction to Geography. 8th ed. McGraw-Hill, 2002.