Jeffreys, M. (2002). Success secrets of fifteen motivational superstars. Jaico.
Lua i Stíl Chicago (17ú heag.)Jeffreys, Michael. Success Secrets of Fifteen Motivational Superstars. Mumbai: Jaico, 2002.
Lua MLA (9ú heag.)Jeffreys, Michael. Success Secrets of Fifteen Motivational Superstars. Jaico, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.