Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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