Dyfyniad APA

Covey, S. R. (2004). The 7 Habits of Highly Effective People. Pocket Books.

Dyfyniad Arddull Chicago

Covey, Stephen R. The 7 Habits of Highly Effective People. Pocket Books, 2004.

Dyfyniad MLA

Covey, Stephen R. The 7 Habits of Highly Effective People. Pocket Books, 2004.

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