Gray, H. P. (1985). Free trade or protectionn: A pragmatic analysis. Macmillan Press.
芝加哥风格引文Gray, H Peter. Free Trade or Protectionn: A Pragmatic Analysis. Basingstoke, Hants, Eng: Macmillan Press, 1985.
MLA引文Gray, H Peter. Free Trade or Protectionn: A Pragmatic Analysis. Macmillan Press, 1985.
警告：这些引文格式不一定是100％准确.