Lua APA (7ú heag.)

Covey, S. R. (1991). Principle-centered leadershipages (First edition.). A Fireside Book.

Lua i Stíl Chicago (17ú heag.)

Covey, Stephen R. Principle-centered Leadershipages. First edition. New York: A Fireside Book, 1991.

Lua MLA (9ú heag.)

Covey, Stephen R. Principle-centered Leadershipages. First edition. A Fireside Book, 1991.

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.