Gaya APA
Covey, S, R.
(1997).
The 7 Habits of Highly Effective People
.
jakarta barat:
Binarupa Aksara.
Gaya MLA
Covey, Stephen, R.
"The 7 Habits of Highly Effective People".
jakarta barat:
Binarupa Aksara,
1997.
Text.