Dyfyniad APA

Covey, S. R. (1989). The seven habits of highly effective people: Restoring the character ethic. Simon and Schuster.

Dyfyniad Arddull Chicago

Covey, Stephen R. The Seven Habits of Highly Effective People: Restoring the Character Ethic. New York: Simon and Schuster, 1989.

Dyfyniad MLA

Covey, Stephen R. The Seven Habits of Highly Effective People: Restoring the Character Ethic. Simon and Schuster, 1989.

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