APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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