Manning, G., & Curtis, K. (2007). The art of leadership (2nd ed.). McGraw-Hill Irwin.
Lua i Stíl Chicago (17ú heag.)Manning, George, agus Kent Curtis. The Art of Leadership. 2nd ed. Boston: McGraw-Hill Irwin, 2007.
Lua MLA (8ú heag.)Manning, George, agus Kent Curtis. The Art of Leadership. 2nd ed. McGraw-Hill Irwin, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.