George S. Clason
Mitch Albom
Great Britain.
Bible
Nathaniel Hawthorne
John Dewey
Steven D. Levitt
Ronald B. Adler
Carl Gustav Jung
Malcolm Gladwell
Chimamanda Ngozi Adichie
Neil Postman
Cathy O'Neil
Paulo Freire
Donella H. Meadows
John H. Falk
Erin Gruwell
Barbara A. Oakley
United States. General Accounting Office
Jean Piaget