Gaya APA

Purnama, H., Ariffin, I, I, I, I, W, J. (2009). Leadership Revolution : Good to Great Leader . Yogyakarta: .

Gaya MLA

Purnama, Harry., Ariffin, I., Irwan,, Ignatius, II., Wijaya,, Johanes. "Leadership Revolution : Good to Great Leader". Yogyakarta: , 2009. .