Gaya APA
Kouzes, J, M., Posner, B, Z. (2010).
The Leadership Challenge Activities Book (First Edition).
San Francisco:
Pfeiffer.
Gaya MLA
Kouzes, James, M.., Posner, Barry, Z..
"The Leadership Challenge Activities Book".
First Edition
San Francisco:
Pfeiffer,
2010.
eBook.