Citazione Stile APA (7a Edizione)

Covey, S. R. (2020). 7 Habits of Highly Effective People. Simon and Schuster.

Citazione stile Chigago Style (17a edizione)

Covey, Stephen R. 7 Habits of Highly Effective People. New Delhi: Simon and Schuster, 2020.

Citatione MLA (9a ed.)

Covey, Stephen R. 7 Habits of Highly Effective People. Simon and Schuster, 2020.