Gaya APA
Covey, Stephen R.. (1989).
The 7 (seven) habits of highly effective people : restoring the character ethic .
New York:
A Fire-Side Book.
Gaya Chicago
Covey, Stephen R..
The 7 (seven) habits of highly effective people : restoring the character ethic.
New York:
A Fire-Side Book,
1989.
Text.
Gaya MLA
Covey, Stephen R..
The 7 (seven) habits of highly effective people : restoring the character ethic.
New York:
A Fire-Side Book,
1989.
Text.
Gaya Turabian
Covey, Stephen R..
The 7 (seven) habits of highly effective people : restoring the character ethic.
New York:
A Fire-Side Book,
1989.
Print.