Gaya APA
Covey, Stephen R.. (1990).
The seven habits of highly effective people: restoring the character ethic .
New York:
Simon & Schuster.
Gaya Chicago
Covey, Stephen R..
The seven habits of highly effective people: restoring the character ethic.
New York:
Simon & Schuster,
1990.
Text.
Gaya MLA
Covey, Stephen R..
The seven habits of highly effective people: restoring the character ethic.
New York:
Simon & Schuster,
1990.
Text.
Gaya Turabian
Covey, Stephen R..
The seven habits of highly effective people: restoring the character ethic.
New York:
Simon & Schuster,
1990.
Print.