APA (7th ed.) Zitazioa

Freeman, O. W., & Raup, H. F. (1959). Essentials of geography (2nd ed.). McGraw-Hill.

Chicago Style (17th ed.) Zitazioa

Freeman, Otis W., eta H. F. Raup. Essentials of Geography. 2nd ed. New York,: McGraw-Hill, 1959.

MLA (9th ed.) Zitazioa

Freeman, Otis W., eta H. F. Raup. Essentials of Geography. 2nd ed. McGraw-Hill, 1959.