Gaya APA
Covey, S, R.
(2013).
The Wisdom and Teachings of Stephen R.Covey
.
Jakarta:
Dunamis Intra Sarana.
Gaya MLA
Covey, Stephen, R.
"The Wisdom and Teachings of Stephen R.Covey".
Jakarta:
Dunamis Intra Sarana,
2013.
Text.