Stuart J. Russell
Stephen R. Covey
Morgan Housel
Clayton M. Christensen
David Graeber
Jason Fried
Marty Cagan
United States. General Accounting Office
Bill Perkins
Stanley Coopersmith
Barbara Sher
Jonah Berger
Frederick Herzberg
Kenneth H. Blanchard
Jeff Gothelf
Michael LeBoeuf
Paula Begoun
Lee G. Bolman