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