Stephen R. Covey
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Michael Lewis
Antony Lewis
Joseph Stiglitz
Tony Robbins
Lee G. Bolman
Steven J. Stein
Joe Vitale
E. F. Schumacher
Joseph E. Stiglitz
Steven D. Levitt
Klaus Schwab
Ram Charan
Andrea C. Hoffmann , Farida Khalaf
Max Altschuler
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