Covey Stephen R. (2004). 7 Habits of highly effective people. Pocket Books.
Lua i Stíl Chicago (17ú heag.)Covey Stephen R. 7 Habits of Highly Effective People. London: Pocket Books, 2004.
Lua MLA (9ú heag.)Covey Stephen R. 7 Habits of Highly Effective People. Pocket Books, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.