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Gaya APA
Covey, S, R. (1989).
The 7 Habits of Highly Effective People: Powerful Lessons in Personal Change (Edisi 1).
New York:
Free Press.
Gaya MLA
Covey, Stephen, R..
"The 7 Habits of Highly Effective People: Powerful Lessons in Personal Change".
Edisi 1
New York:
Free Press,
1989.
Text.