Dyfyniad APA

Kouzes, J. M., & Posner, B. Z. (2007). The leadership challenge (4th ed.). Jossey-Bass.

Dyfyniad Arddull Chicago

Kouzes, James M., and Barry Z. Posner. The Leadership Challenge. 4th ed. San Francisco, USA: Jossey-Bass, 2007.

Dyfyniad MLA

Kouzes, James M., and Barry Z. Posner. The Leadership Challenge. 4th ed. Jossey-Bass, 2007.

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