Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.