Gaya APA
Covey, S, R.
(2010).
The 7 Habits of Highly Effective People
.
Tangerang:
Binarupa Aksara.
Gaya MLA
Covey, Stephen, R.
"The 7 Habits of Highly Effective People".
Tangerang:
Binarupa Aksara,
2010.
Text.