Gaya APA

Kouzes, J, N, &, P, B, Z. (1990). The Leadership Challenge; How to Get ExtraordinaryThings Done in Organization . San Francisco: Jossey-Bass Pub..

Gaya MLA

Kouzes, James, N., &, Pasner,, Bozry, Z.. "The Leadership Challenge; How to Get ExtraordinaryThings Done in Organization". San Francisco: Jossey-Bass Pub., 1990. Text.