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
 eBooks
Abrahan, Joe,author
Entrepreneurial DNA : the breakthrough discovery that aligns your business to your unique strengths
McGraw-Hill, 2011
 Buku Teks SO
Wilson, Susan B.
Goal setting: how to create an action plan and achieve your goals
American Management Association, 2008
 eBooks
Humes. James C.
Talk your way to the top/ James C. Humes
McGraw-Hill , 1980
 Buku Teks