Bongard, M. Pattern Recognition. Rochelle Park, N.J.: Hayden Book Co., Spartan Books, 1970.
Escher, Maurits C., et al. The World of M.C. Escher. New York: Harry N. Abrams, 1972.
Gödel, Kurt. On Formally Undecidable Propositions. New York: Basic Books, 1962. A translation of Gödel's 1931 paper, together with some discussion (Über Formal Unentscheidbare Sätze der Principia Mathematica und Verwandter Systeme, I).
Hoare, C.A.R. and D.C.S. Allison, "Incomputability". Computing Surveys 4, no. 3 (September 1972).
Monod, Jacques. Chance and Necessity. New York: Random House, Vintage Books, 1971.
Schrödinger, Erwin. What is Life? & Mind and Matter. New York: Cambridge University Press, 1967.
Simon, Herbert A. The Sciences of the Artificial. Cambridge, Mass: M.I.T. Press, 1969.
Winograd, Terry. Understanding Natural Language. New York: Academic Press, 1972.