1. Aquinatis, S. Thomæ Doctoris Angelici Opera Omnia (Sixteen Volumes). Iussu impensaque Leonis XIII P.M. edita ex Typographia Polyglotta, Rome 1882–1948.
2. Chomsky, Noam (1976 a) Reflections on Language. Pantheon Books, New York.
3. Chomsky, Noam (1976 b) On the nature of language. Ann. N.Y. Acad. Sci. 280, 46–57.
4. Churchman, C. West (1988) “Discoveries in an Exploration into Systems Thinking” in Yearbook of the International Society for the Systems Sciences, Vol. XXXI (ed. William J. Reckmeyer). New York: ISSS, pp. 39–44.
5. Ericson, Richard F. (1987) “System-Induced Hypocrisies: Our Quintessential Moral Dilemma” in Yearbook of the International Society for Systems Research, Vol XXX (ed. John A. Dillon, Jr.). Louisville: ISGSR, pp. 77–81.