APA (7th ed.) Citation

Huntington, E., Williams, F. E., Van Valkenburg, S., & Visher, S. S. (1940). Principles of economic geography. J. Wiley & sons.

Chicago Style (17th ed.) Citation

Huntington, Ellsworth, Frank Ernest Williams, Samuel Van Valkenburg, and Stephen Sargent Visher. Principles of Economic Geography. New York: J. Wiley & sons, 1940.

MLA (9th ed.) Citation

Huntington, Ellsworth, et al. Principles of Economic Geography. J. Wiley & sons, 1940.