APA Style

Posner, J, M, K, B, Z. (2012). The leadership challenge : how to make extraordinary things happen in organizations (5th ed). by Jossey-Bass: .

MLA Style

Posner, James, M., Kouzes,, Barry, Z.. "The leadership challenge : how to make extraordinary things happen in organizations". 5th ed by Jossey-Bass: , 2012. Electronic Resource.