7Edgeworth, F Y. "The Pure Theory of Taxation." Reprinted in Readings in the Economics of Taxation, ed. Richard A Musgrave and Carl S Shoup. Homewood. IL: Richard D. Irwin, 1959. Pigou,"A C. The Economics of Welfare." New York: Macmillan, 1932.
8Vickry, "The Problem of Progression" University of Florida Law Review, 1968.
