Gaya APA
Covey, Stephen R.. (1990).
The 7 Habits of Highly Effetive People .
Singapore:
A Fireside Book.
Gaya Chicago
Covey, Stephen R..
The 7 Habits of Highly Effetive People.
Singapore:
A Fireside Book,
1990.
Text.
Gaya MLA
Covey, Stephen R..
The 7 Habits of Highly Effetive People.
Singapore:
A Fireside Book,
1990.
Text.
Gaya Turabian
Covey, Stephen R..
The 7 Habits of Highly Effetive People.
Singapore:
A Fireside Book,
1990.
Print.