Παραπομπή σε μορφή APA (7η εκδ.)

Covey, S. R. The 7 habits of highly effective people: Restoring the character ethic (Revised edition.).

Παραπομπή σε μορφή Chicago (17η εκδ.)

Covey, Stephen R. The 7 Habits of Highly Effective People: Restoring the Character Ethic. Revised edition.

Παραπομπή σε μορφή MLA (8th εκδ.)

Covey, Stephen R. The 7 Habits of Highly Effective People: Restoring the Character Ethic. Revised edition.