Riggs, J. L., & Bethel, L. L. (1979). Industrial organization and management (6th ed.). McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Riggs, James L., agus Lawrence L. Bethel. Industrial Organization and Management. 6th ed. New York: McGraw-Hill, 1979.
Lua MLA (9ú heag.)Riggs, James L., agus Lawrence L. Bethel. Industrial Organization and Management. 6th ed. McGraw-Hill, 1979.
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