Gaya APA
COVEY, Stephen R.. (1991).
Principle-centered leadership .
New York:
Summit Books.
Gaya Chicago
COVEY, Stephen R..
Principle-centered leadership.
New York:
Summit Books,
1991.
Textbook.
Gaya MLA
COVEY, Stephen R..
Principle-centered leadership.
New York:
Summit Books,
1991.
Textbook.
Gaya Turabian
COVEY, Stephen R..
Principle-centered leadership.
New York:
Summit Books,
1991.
Textbook.