Tracy, Brian, author
Focal point: a proven system to simplify your life, double your productivity, and achieve all your goals
American Management Association, 2002
 eBooks
Pearson, Barrie, author
Common-sense business Strategy : how to improve your profits and cash flow dramatically
Mercurry, 1991
 Buku Teks
Swartz, Greg, author
Leadership lessons: 10 keys to success in life and business
American Society for Training & Development, 2008
 eBooks
Sarah, author
Reinventing yourself with the duchess of york : inspiring stories and strategies for changing your weight and your life
Simon & Schuster, 2001
 Buku Teks
Humes. James C.
Talk your way to the top/ James C. Humes
McGraw-Hill , 1980
 Buku Teks
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