Vitale, J. (2007). The seven lost secrets of success: Million dollar ideas of Bruce Barton, America's forgotten genius. John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)Vitale, Joe. The Seven Lost Secrets of Success: Million Dollar Ideas of Bruce Barton, America's Forgotten Genius. Hoboken, N.J.: John Wiley & Sons, 2007.
Lua MLA (8ú heag.)Vitale, Joe. The Seven Lost Secrets of Success: Million Dollar Ideas of Bruce Barton, America's Forgotten Genius. John Wiley & Sons, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.