1. Design for a brain. New, York: John Wiley, 1954.
2. Is information retrieval approaching a crisis? ONR Report, December 1961. (Also in Bar-Hillel, Language and information. Reading, Mass.: Addison-Wesley, 1964, Pp. 365–372.)
3. Why machines won't learn to translate well. ONR Report, January 1963.
4. & Stochastic models for learning. New York: John Wiley, 1955.
5. & Number theory. In (Ed.), A survey of numerical analysis. New York: McGraw-Hill, 1962, Pp. 543–551.