Kouzes, J. M., & Posner, B. Z. (2017). THE LEADERSHIP CHALLENGE WORKBOOK. San Francisco, CA : The Leadership Challenge.
Lua i Stíl Chicago (17ú heag.)Kouzes, James M., agus Barry Z. Posner. THE LEADERSHIP CHALLENGE WORKBOOK. San Francisco, CA : The Leadership Challenge, 2017.
Lua MLA (9ú heag.)Kouzes, James M., agus Barry Z. Posner. THE LEADERSHIP CHALLENGE WORKBOOK. San Francisco, CA : The Leadership Challenge, 2017.
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