APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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

Let op: Deze citaties zijn niet altijd 100% accuraat.