Gaya APA
R, C. (1989).
The 7 Habits of Highly Effective People .
New York:
A fireside Book published by Simon & Schuster.
Gaya MLA
R, COVEY,Stephen.
"The 7 Habits of Highly Effective People".
New York:
A fireside Book published by Simon & Schuster,
1989.
Text.