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  1. Symbolic logic.Clarence Irving Lewis - 1932 - [New York]: Dover Publications. Edited by Cooper Harold Langford.
  • Methods of Logic.P. L. Heath & Willard Van Orman Quine - 1955 - Philosophical Quarterly 5 (21):376.
  • A Formalization of the Logic of Ordinary Conditionals.William Secord Cooper - 1964 - Dissertation, University of California, Berkeley