Branson, Richard, author
Screw it, let's do it. expanded : lessons in life and business
Virgin Books, 2007
 Buku Teks
Tambunan, Emil H., author
Kepribadian Seutuhnya : terobosan mencapai hidup berdaya guna dan sukses
Indonesia Publishing House, 2007
 Buku Teks
Schuller, Robert H., author
Keuletan kunci keberhasilan : masa yang sulit tidak pernah berakhir, tetapi orang yang ulet akan berhasil mengatasinya
Gunung Mulia, 1986
 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
Bryan Lo`s, author
Wealth life : the easy lifestyle to achieve happiness, wealth and financial freedom
Awesome Books Publishing SDN BHN, 2002
 Buku Teks
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