KOONTZ, H. (1990). Essential Of Management. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)KOONTZ, Harold. Essential Of Management. McGraw-Hill, 1990.
Lua MLA (8ú heag.)KOONTZ, Harold. Essential Of Management. McGraw-Hill, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.