1. Kazimierz Ajdukiewicz, ?Die syntaktische Konnexität?, Studia Philosophica 1 (1935) 1?27; translated as ?Syntactic Connexion? in S. McCall, Polish Logic, Oxford 1967, pp. 207?231. Part I translated as ?On Syntactical Coherence?, Review of Metaphysics 20 (1966) 635?647.
2. J. L. Austin, How to Do Things with Words, Harvard University Press, Cambridge, Mass., 1962.
3. Yehoshua Bar-Hillel, Language and Information, Addison-Wesley, Reading, Mass., 1964.
4. Paul Benacerraf, ?What Numbers Could Not Be?, Philosophical Review 74 (1965) 47?73.
5. Rudolf Carnap, Meaning and Necessity, University of Chicago Press, Chicago, Illinois, 1947.