Covey Stephen R. (2004). Seven habits Of Highly Effective People. Simon Schuster.
Lua i Stíl Chicago (17ú heag.)Covey Stephen R. Seven Habits Of Highly Effective People. London: Simon Schuster, 2004.
Lua MLA (9ú heag.)Covey Stephen R. Seven Habits Of Highly Effective People. Simon Schuster, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.