Covey, S. R. (2004). The 8th habit: From effectiveness to greatness (First edition.). Free Press.
Chicago-referens (17:e uppl.)Covey, Stephen R. The 8th Habit: From Effectiveness to Greatness. First edition. New York: Free Press, 2004.
MLA-referens (9:e uppl.)Covey, Stephen R. The 8th Habit: From Effectiveness to Greatness. First edition. Free Press, 2004.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.