Gaya APA
Covey, Stephen R.. (1992).
Principle - Centered Leadership (Cet. 1.--).
London:
Simon & Schuster.
Gaya Chicago
Covey, Stephen R..
Principle - Centered Leadership.
Cet. 1.--
London:
Simon & Schuster,
1992.
Text.
Gaya MLA
Covey, Stephen R..
Principle - Centered Leadership.
Cet. 1.--
London:
Simon & Schuster,
1992.
Text.
Gaya Turabian
Covey, Stephen R..
Principle - Centered Leadership.
Cet. 1.--
London:
Simon & Schuster,
1992.
Print.