Cita APA

Whitbeck, R. H. 1. -. 1., & Williams, F. E. (1940). Economic geography of South America (3. edition.). New York, New York: McGraw-Hill.

Citación estilo Chicago

Whitbeck, Ray Hughes 1871 - 1939, y Frank E. Williams. Economic Geography of South America. 3. edition. New York, New York: McGraw-Hill, 1940.

Cita MLA

Whitbeck, Ray Hughes 1871 - 1939, y Frank E. Williams. Economic Geography of South America. 3. edition. New York, New York: McGraw-Hill, 1940.