Koontz, H. (1998). Essentials of management-5th ed (5th.).
Lua i Stíl Chicago (17ú heag.)Koontz, Harold. Essentials of Management-5th Ed. 5th. New Delhi, 1998.
Lua MLA (9ú heag.)Koontz, Harold. Essentials of Management-5th Ed. 5th. 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.