MacGregor, Sandy
Students steps to success : 7 langkah menuju sukses = students steps to success
Hikmah, 2007
 Buku Teks SO
Cerney, J.V.
Stay younger - live longer through the magic of mental self-conditioning
Parker Publishing Company, Inc. , 1968
 Buku Teks
Humes. James C.
Talk your way to the top/ James C. Humes
McGraw-Hill , 1980
 Buku Teks
Christiansen, Rich, 1965-
The zigzag principle: the goal-setting strategy that will revolutionize your business and your life
McGraw-Hill, 2012
 Buku Teks
Tracy, Brian
Focal point: a proven system to simplify your life, double your productivity, and achieve all your goals
American Management Association, 2002
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