APA (7e ed.) Bronvermelding

Getis, A., Getis, V., & Bjelland, M. D. (2018). Introduction to geography (Fifteenth edition.). McGraw-Hill Education.

Chicago (17e ed.) Bronvermelding

Getis, Arthur, Victoria Getis, en Mark D. Bjelland. Introduction to Geography. Fifteenth edition. New York, NY: McGraw-Hill Education, 2018.

MLA (9e ed.) Bronvermelding

Getis, Arthur, et al. Introduction to Geography. Fifteenth edition. McGraw-Hill Education, 2018.