Citazione Stile APA (7a Edizione)

Covey, S. R. (2004). The 8th habit: From effectiveness to greatness. Free Press.

Citazione stile Chigago Style (17a edizione)

Covey, Stephen R. The 8th Habit: From Effectiveness to Greatness. New York: Free Press, 2004.

Citatione MLA (8a ed.)

Covey, Stephen R. The 8th Habit: From Effectiveness to Greatness. Free Press, 2004.