APA Style
Covey, Stephen R. (1991).
Principle-Centered Leadership .
New York:
Summit Books.
Chicago Style
Covey, Stephen R.
Principle-Centered Leadership.
New York:
Summit Books,
1991.
Text.
MLA Style
Covey, Stephen R.
Principle-Centered Leadership.
New York:
Summit Books,
1991.
Text.
Turabian Style
Covey, Stephen R.
Principle-Centered Leadership.
New York:
Summit Books,
1991.
Print.