APA Style
Covey, S, R. (1992).
Principle-Centered Leadership : A Philosophy For Life And For Succes in Business (1).
Sydney:
Simon & Schuster.
MLA Style
Covey, Stephen, R.
"Principle-Centered Leadership : A Philosophy For Life And For Succes in Business".
1
Sydney:
Simon & Schuster,
1992.
Manajemen.