Παραπομπή σε μορφή APA (7η εκδ.)

Covey Stephen R. (1999). The 7 habits of highly effective people: Restoring the character ethic. Simon & Schuster.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Covey Stephen R. The 7 Habits of Highly Effective People: Restoring the Character Ethic. Simon & Schuster, 1999.

Παραπομπή σε μορφή MLA (8th εκδ.)

Covey Stephen R. The 7 Habits of Highly Effective People: Restoring the Character Ethic. Simon & Schuster, 1999.