Gaya APA
Covey, S. et al (2012).
The 4 Disciplines of Execution : Achieving Your Wildly Important Goals .
Bandung:
Free Press.
Gaya MLA
Covey, Sean. et al.
"The 4 Disciplines of Execution : Achieving Your Wildly Important Goals".
Bandung:
Free Press,
2012.
.