Gaya APA
Covey, S, R. (2004).
The 7 Habits of Highly Effective People: Powerful Lessons in Personal Change .
Sydney:
Simon & Scuster.
Gaya MLA
Covey, Stephen, R..
"The 7 Habits of Highly Effective People: Powerful Lessons in Personal Change".
Sydney:
Simon & Scuster,
2004.
Text.