Joseph Persky and Herbert Tsang (February 1974). "Pigouvian Exploitation of Labor". The Review of Economics and Statistics. 56 (1): 52–57. doi:10.2307/1927526. JSTOR1927526.
Joseph Persky and Herbert Tsang (February 1974). "Pigouvian Exploitation of Labor". The Review of Economics and Statistics. 56 (1): 52–57. doi:10.2307/1927526. JSTOR1927526.