==William Baumol==
'''
Baumol, William J. 1968. “Entrepreneurship in Economic Theory.” The American Economic Review, 64–71.
———'''Baumol, William J. 19961968. “Entrepreneurship: Productive, Unproductive, and Destructivein Economic Theory.” Journal of Business Venturing 11 (1): 3–22The American Economic Review, 64–71.'''
'''———. 20021996. The Free-Market Innovation Machine“Entrepreneurship: Analyzing the Growth Miracle Productive, Unproductive, and Destructive.” Journal of Capitalism. Princeton University PressBusiness Venturing 11 (1): 3–22.'''
'''———. 2002. The Free-Market Innovation Machine: Analyzing the Growth Miracle of Capitalism. Princeton University Press.
'''
@article{baumol_entrepreneurship:_1996,
title = {Entrepreneurship: {Productive}, unproductive, and destructive},