Getis, A., Getis, J., & Fellmann, J. D. (2008). Introduction to geography (Eleventh ed.). McGraw-Hill Higher Education.
Citazione stile Chigago Style (17a edizione)Getis, Arthur, Judith Getis, e Jerome D. Fellmann. Introduction to Geography. Eleventh ed. Boston: McGraw-Hill Higher Education, 2008.
Citatione MLA (9a ed.)Getis, Arthur, et al. Introduction to Geography. Eleventh ed. McGraw-Hill Higher Education, 2008.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.