Cita APA (7th ed.)

Webb, W. P. (1931). The great plains. Grosset-Dunlap.

Cita Chicago (17th ed.)

Webb, Walter Prescott. The Great Plains. Nueva York: Grosset-Dunlap, 1931.

Cita MLA (9th ed.)

Webb, Walter Prescott. The Great Plains. Grosset-Dunlap, 1931.