Dyfyniad APA

Covey, S. R. (2020). 7 Habits of Highly Effective People. Simon and Schuster.

Dyfyniad Arddull Chicago

Covey, Stephen R. 7 Habits of Highly Effective People. New Delhi: Simon and Schuster, 2020.

Dyfyniad MLA

Covey, Stephen R. 7 Habits of Highly Effective People. Simon and Schuster, 2020.

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