Christiansen, Rich, 1965-, author
The zigzag principle: the goal-setting strategy that will revolutionize your business and your life
McGraw-Hill, 2012
 Buku Teks
Broughton, Philip Delves, author
The art of the sale : learning from the masters about the business of life
The Penguin Press, 2012
 Buku Teks
Cottrell, David, author
A mentor's perspective on reigniting success : Tuesday morning coaching : eight simple truths to boost your career and your life / David Cottrell
McGraw-Hill , 2013
 Buku Teks
Swartz, Greg, author
Leadership lessons: 10 keys to success in life and business
American Society for Training & Development, 2008
 eBooks
Siegel, Liza, author
Suite success: the psychologist from the apprentice reveals what it really takes to excel-- in the boardroom and in life
American Management Association, 2006
 eBooks
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