1. Schumpeter, Joseph A. History of Economic Analysis. New York: Oxford University Press, (1954) 1968.
2. Nash, L. R. The Economics of Public Utilities. New York: McGraw-Hill, 1925.
3. Marshall, Alfred. Industry and Trade. 4th ed. London: Macmillan, 1923. Reprint. New York: August M. Kelley, 1970.
4. Liebhafsky, H. H. American Business and Government. New York: John Wiley and Sons, Inc., 1971.
5. Bonbright, James C. Principles of Public Utility Regulation. New York: Columbia University Press, 1961.