Hellman, R. (1972). Government competition in the electric utility industry: A theoretical and empirical study. Praeger Publishers.
芝加哥风格引文Hellman, Richard. Government Competition in the Electric Utility Industry: A Theoretical and Empirical Study. New York: Praeger Publishers, 1972.
MLA引文Hellman, Richard. Government Competition in the Electric Utility Industry: A Theoretical and Empirical Study. Praeger Publishers, 1972.
警告：这些引文格式不一定是100％准确.