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- O'Sullivan, Arthur; Sheffrin, Steven M. (2003). Economics: Principles in Action. Upper Saddle River, New Jersey 07458: Pearson Prentice Hall. p. 551. ISBN 0-13-063085-3.
- Ryan, John Augustine (1916). Distributive justice: the right and wrong of our present distribution of wealth. Macmillan. p. 328. Retrieved 7 December 2010.
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