Branson, Richard, author
Screw it, let's do it. expanded : lessons in life and business
Virgin Books, 2007
 Buku Teks
Robbins, Anthony
Awaken the giant within : how to take immediate control of your mental, emotional, physical & financial destiny!
A Freeside Book, 1991
 Buku Teks
Maxwell, John C., author
Perjalanan menuju sukses
Harvest Publication House, 1997
 Buku Teks
Covey, Stephen R., author
The 7 habits of highly effective people = 7 (tujuh) kebiasaan manusia yang sangat efektif
Dunamis, 2015
 Buku Teks
Covey, Stephen R., author
The 7 habits of highly effective people: powerful lessons in personal change
Simon &​ Schuster, 2013
 Buku Teks
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