Citazione Stile APA (7a Edizione)
Covey, S. R. (2004). The 7 Habits of Highly Effective People (25th Anniversary Edition.). Pocket Books.
Citazione stile Chigago Style (17a edizione)
Covey, Stephen R. The 7 Habits of Highly Effective People. 25th Anniversary Edition. London: Pocket Books, 2004.
Citatione MLA (9a ed.)
Covey, Stephen R. The 7 Habits of Highly Effective People. 25th Anniversary Edition. Pocket Books, 2004.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.