Gaya APA
Covey, R, S. (2013).
The 7 Habits of Highly Effective People (ed. Revisided).
Tangerang:
Binarupa Aksara Publisher.
Gaya MLA
Covey, R., Stephen.
"The 7 Habits of Highly Effective People".
ed. Revisided
Tangerang:
Binarupa Aksara Publisher,
2013.
.