Gaya APA

Kouzes, J, M., Posner, B, Z. (1987). The Leadership challenge : how to get extraordinary things done in organizations . San Francisco: Jossey-Bass.

Gaya MLA

Kouzes, James, M.., Posner, Barry, Z.. "The Leadership challenge : how to get extraordinary things done in organizations". San Francisco: Jossey-Bass, 1987. Text.