Gaya APA

Getis, A., Fellman, J, G, J, D. (2008). Introduction to Geography (11). New York: MC GRAW - HILL Higher Education.

Gaya MLA

Getis, Arthur., Fellman, Judith, Getis,, Jerome, D.. "Introduction to Geography". 11 New York: MC GRAW - HILL Higher Education, 2008. Text.