Gaya APA

Kouzes, J, M., Posner, B, Z. (2004). the Leadership Challenge (Edisi 3. Cet. 1). Jakarta: Erlangga.

Gaya MLA

Kouzes, James, M.., Posner, Barry, Z.. "the Leadership Challenge". Edisi 3. Cet. 1 Jakarta: Erlangga, 2004. Text.