Manning, G. (2003). The art of leadershipGeorge Manning, Kent Curtis. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Manning, George. The Art of LeadershipGeorge Manning, Kent Curtis. McGraw-Hill, 2003.
Lua MLA (8ú heag.)Manning, George. The Art of LeadershipGeorge Manning, Kent Curtis. McGraw-Hill, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.