Citazione Stile APA (7a Edizione)

Covey, S. R. (2013). The 7 Habits of Highly Effective People. Simon & Schuster.

Citazione stile Chigago Style (17a edizione)

Covey, Stephen R. The 7 Habits of Highly Effective People. UK: Simon & Schuster, 2013.

Citatione MLA (9a ed.)

Covey, Stephen R. The 7 Habits of Highly Effective People. Simon & Schuster, 2013.