Gaya APA
Covey, S, R. (2004).
The 7 Habits of Highly Effective People; Powerful Lessons in Personal Change .
Tangerang:
Gramedia Pustaka Utama.
Gaya MLA
Covey, Stephen, R..
"The 7 Habits of Highly Effective People; Powerful Lessons in Personal Change".
Tangerang:
Gramedia Pustaka Utama,
2004.
Text.