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 Aristotle (384–322 BCE). Prior Analytics

 Fred R. Berger (1977). Studying Deductive Logic

 S.K. Langer (2011). ‘Truth and validity'. In: Introduction to Symbolic Logic, 3rd edn, Ch. 1, pp. 182–90

 * Jc Beall and Shay Allen Logan (2017). Logic: The Basics, 2nd edn