Covey, S. R. (2013). The 7 Habits of Highly Effective People. Simon & Schuster.
Lua i Stíl Chicago (17ú heag.)Covey, Stephen R. The 7 Habits of Highly Effective People. UK: Simon & Schuster, 2013.
Lua MLA (9ú heag.)Covey, Stephen R. The 7 Habits of Highly Effective People. Simon & Schuster, 2013.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.