Powell, C. L., & Koltz, T. (2012). It worked for me: In life and leadership (First edition.). Harper.
Lua i Stíl Chicago (17ú heag.)Powell, Colin L., agus Tony Koltz. It Worked for Me: In Life and Leadership. First edition. New York: Harper, 2012.
Lua MLA (9ú heag.)Powell, Colin L., agus Tony Koltz. It Worked for Me: In Life and Leadership. First edition. Harper, 2012.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.