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
Sharma, Robin
The Leader who had no title : a modern fable on real success in business and in life
Free Press, 2010
 Buku Teks
McHugh, Donald E.
Golf and the game of leadership: an 18-hole guide for success in business and in life
[American Management Association;, ], 2004
 eBooks
Christiansen, Rich, 1965-
The zigzag principle: the goal-setting strategy that will revolutionize your business and your life
McGraw-Hill, 2012
 Buku Teks