Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Webb, Walter Prescott. The Great Plains. New York, Estados Unidos: Grosset and Dunlap, 1931.

Cita MLA (9a ed.)

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