Dyfyniad APA

Lee, B., & Covey, S. R. (1998). The power principle: Influence with honor (First Fireside edition.). Simon & Schuster.

Dyfyniad Arddull Chicago

Lee, Blaine, and Stephen R. Covey. The Power Principle: Influence with Honor. First Fireside edition. New York, NY: Simon & Schuster, 1998.

Dyfyniad MLA

Lee, Blaine, and Stephen R. Covey. The Power Principle: Influence with Honor. First Fireside edition. Simon & Schuster, 1998.

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