DuBrin, A. J. (2000). Essentials of management (5th ed.). South-Western.
Lua i Stíl Chicago (17ú heag.)DuBrin, Andrew J. Essentials of Management. 5th ed. Cincinnati, Ohio: South-Western, 2000.
Lua MLA (9ú heag.)DuBrin, Andrew J. Essentials of Management. 5th ed. South-Western, 2000.
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