1. Pareto, V.,Manuale di Economia Politica, Società Editrice Libraria, Milano, Italy, 1906; Piccola Biblioteca Scientifica No. 13, Società Editrice Libraria, Milano, Italy, 1919. Translated into French, with Revised Mathematical Appendix, by Girard and Brière, asManuel D'Economie Politique, Giard, Paris, France, First Edition, 1909 and Second Edition, 1927. Translated into English by A. S. Schwier, asManual of Political Economy, The MacMillan Company, New York, New York, 1971.
2. Pareto, V.,Sociological Writings, Selected and Introduced by S. E. Finer, Translated by D. Mirfin, Frederick A. Praeger, New York, New York, 1966.
3. Pfanzagl, J.,Theory of Measurement, Physica-Verlag, Würzburg-Wien, Germany, 1968.
4. Hausdorff, F.,Mengenlehre, Walter de Gruyter & Companie, Berlin-Leipzig, Germany, 1927. Translated into English asSet Theory, Chelsea Publishing Company, New York, New York, 1957.
5. Debreu, G.,Representation of a Preference Ordering by a Numerical Function, Decision Processes, Edited by R. M. Thrall, C. H. Coombs, and R. L. Davis, John Wiley and Sons, New York, New York, pp. 159?165, 1954.