Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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