Gaya APA
Covey, Stephen R.. (1990).
The 7 Habits of Highly Efective People (Kesatu).
New York:
A Fireside Book.
Gaya Chicago
Covey, Stephen R..
The 7 Habits of Highly Efective People.
Kesatu
New York:
A Fireside Book,
1990.
.
Gaya MLA
Covey, Stephen R..
The 7 Habits of Highly Efective People.
Kesatu
New York:
A Fireside Book,
1990.
.
Gaya Turabian
Covey, Stephen R..
The 7 Habits of Highly Efective People.
Kesatu
New York:
A Fireside Book,
1990.
.