APA (7th ed.) Citation

Whitbeck, R. H., Williams, F. E., & Christians, W. F. (1940). Economic geography of South America (3d ed.). McGraw-Hill book company, inc..

Chicago Style (17th ed.) Citation

Whitbeck, R. H., Frank Ernest Williams, and William Florian Christians. Economic Geography of South America. 3d ed. New York, London: McGraw-Hill book company, inc., 1940.

MLA (9th ed.) Citation

Whitbeck, R. H., et al. Economic Geography of South America. 3d ed. McGraw-Hill book company, inc., 1940.