Blank, W. (1995). The 9 natural laws of leadership. AMACOM; VIVA Books Private Ltd..
Lua i Stíl Chicago (17ú heag.)Blank, Warren. The 9 Natural Laws of Leadership. New York; New Delhi: AMACOM; VIVA Books Private Ltd., 1995.
Lua MLA (8ú heag.)Blank, Warren. The 9 Natural Laws of Leadership. AMACOM; VIVA Books Private Ltd., 1995.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.