Gaya APA
Covey, S, R. (2004).
The 7 Habits of Higly Effective People: Powerfull lessons in Personal Change .
Newyork:
Simon & Schuster, 2004.
Gaya MLA
Covey, Stephen, R..
"The 7 Habits of Higly Effective People: Powerfull lessons in Personal Change".
Newyork:
Simon & Schuster, 2004,
2004.
Book.