Kotter, J. P. (1990). A force for change: How leadership differs from management. Free Press ; Collier Macmillan.
Lua i Stíl Chicago (17ú heag.)Kotter, John P. A Force for Change: How Leadership Differs from Management. New York : London: Free Press ; Collier Macmillan, 1990.
Lua MLA (8ú heag.)Kotter, John P. A Force for Change: How Leadership Differs from Management. Free Press ; Collier Macmillan, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.