Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (8a ed.)

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

Attenzione: Queste citazioni potrebbero non essere precise al 100%.