Gaya APA
Covey, S, R.
(2013).
The wisdom and teachings of Stephen R. Covey
.
Jakarta:
PT. Dunamis Intra sarana.
Gaya MLA
Covey, Stephen, R..
"The wisdom and teachings of Stephen R. Covey".
Jakarta:
PT. Dunamis Intra sarana,
2013.
UMUM.