Citazione Stile APA (7a Edizione)

Covey, S. R. (2006). The 8th habit personal workbook (1st Free Press trade pbk. ed.). Free Press.

Citazione stile Chigago Style (17a edizione)

Covey, Stephen R. The 8th Habit Personal Workbook. 1st Free Press trade pbk. ed. New York: Free Press, 2006.

Citatione MLA (8a ed.)

Covey, Stephen R. The 8th Habit Personal Workbook. 1st Free Press trade pbk. ed. Free Press, 2006.