Gaya APA
Covey,Stephen, .
(2013).
The 7 Habits Of Highly Effective People
.
Tangerang:
Binarupa Aksara.
Gaya MLA
Covey,Stephen, .
"The 7 Habits Of Highly Effective People".
Tangerang:
Binarupa Aksara,
2013.
Text.