1. Infinite Abelian Groups, Vol. I, Academic Press, New York 1970.
2. Homology. Springer-Verlag, Berlin-Heidelberg-New York 1975.
3. On nonstandard models for number theory. In: Essays on the Foundations of Mathematics, Magnes Press, Hebrew University, Jerusalem 1961, pp. 259–268.
4. On models of the elementary theory of (Z, +, 1)
5. Addition in nonstandard models of arithmetic