Covey, Stephen R., author
The 7 habits of highly effective people: powerful lessons in personal change
Simon &​ Schuster, 2013
 Buku Teks
Covey, Stephen R., author
The sevevn habits of highly effective people : powerfull lessons in personal change
Simon & Schuster , 1990
 Buku Teks
Tracy, Brian, author
Change your thinking change your life : how to unlock your full potential for success and achievement
John Wiley & Sons, 2003
 Buku Teks
Oech, Roger Von, author
Whack: pukulan untuk merangsang kreativitas dan ide baru
Bhuana Ilmu Populer, 2008
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Bryan Lo`s, author
Wealth life : the easy lifestyle to achieve happiness, wealth and financial freedom
Awesome Books Publishing SDN BHN, 2002
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