Dyfyniad APA

Covey, S. R. The 7 habits of highly effective people: Restoring the character ethic (Revised edition.).

Dyfyniad Arddull Chicago

Covey, Stephen R. The 7 Habits of Highly Effective People: Restoring the Character Ethic. Revised edition.

Dyfyniad MLA

Covey, Stephen R. The 7 Habits of Highly Effective People: Restoring the Character Ethic. Revised edition.

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