Gaya APA
Covey, Stephen R.. (1990).
Principle-Centered Leadership: The Teaching Timeless Principles Of Effectiveness .
Utah:
The Institute Principle-Centered Leadership.
Gaya Chicago
Covey, Stephen R..
Principle-Centered Leadership: The Teaching Timeless Principles Of Effectiveness.
Utah:
The Institute Principle-Centered Leadership,
1990.
Text.
Gaya MLA
Covey, Stephen R..
Principle-Centered Leadership: The Teaching Timeless Principles Of Effectiveness.
Utah:
The Institute Principle-Centered Leadership,
1990.
Text.
Gaya Turabian
Covey, Stephen R..
Principle-Centered Leadership: The Teaching Timeless Principles Of Effectiveness.
Utah:
The Institute Principle-Centered Leadership,
1990.
Print.