Cita APA (7th ed.)

Wheeler, J. O., & Muller, P. O. (1981). Economic geography. Wiley.

Cita Chicago (17th ed.)

Wheeler, James O., i Peter O. Muller. Economic Geography. New York: Wiley, 1981.

Cita MLA (9th ed.)

Wheeler, James O., i Peter O. Muller. Economic Geography. Wiley, 1981.