Gaya APA

Kouzes, J, M., Posner, B, Z. (2012). The Leadership Challenge : How to Make Extraordinary Things Happen in Organizations (5). San Fransisco: The Leadership Challenge.

Gaya MLA

Kouzes, James, M.., Posner, Barry, Z.. "The Leadership Challenge : How to Make Extraordinary Things Happen in Organizations". 5 San Fransisco: The Leadership Challenge, 2012. Texts.