KRAMES JEFFEREY A. (2002). JACK WELCH LEXION OF LEADERSHIP. MCGRAW-HILL.
Lua i Stíl Chicago (17ú heag.)KRAMES JEFFEREY A. JACK WELCH LEXION OF LEADERSHIP. NEW YORK: MCGRAW-HILL, 2002.
Lua MLA (9ú heag.)KRAMES JEFFEREY A. JACK WELCH LEXION OF LEADERSHIP. MCGRAW-HILL, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.