Gaya APA
Covey, S. (2006).
The 6 Most Important Decisions You'll Ever Make (Cetakan 1).
Tangerang:
Karisma Publishing Group.
Gaya MLA
Covey, Sean.
"The 6 Most Important Decisions You'll Ever Make".
Cetakan 1
Tangerang:
Karisma Publishing Group,
2006.
Text.