Riggs, J. L., & Bethel, L. L. (1979). Industrial organization and management (6th ed.). McGraw-Hill.

Riggs, James L., and Lawrence L. Bethel. Industrial Organization and Management. 6th ed. New York: McGraw-Hill, 1979.

Riggs, James L., and Lawrence L. Bethel. Industrial Organization and Management. 6th ed. McGraw-Hill, 1979.