GETIS, A., GETIS, J., BJELLAND, M., & FELLMANN, J. D. (2011). Introduction to geography. McGraw-Hill Book Company.
Lua i Stíl Chicago (17ú heag.)GETIS, Arthur, Judith GETIS, Mark BJELLAND, agus Jerome D. FELLMANN. Introduction to Geography. McGraw-Hill Book Company, 2011.
Lua MLA (9ú heag.)GETIS, Arthur, et al. Introduction to Geography. McGraw-Hill Book Company, 2011.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.