, 1978, Semiotics and linguistic structures: A primer of philophic logic, SUNY Press, Albany.
, 1974a, On Kant, Frege, analyticity and the theory of reference, in L. White Beck (ed.), Kant's theory of knowledge, Dordrecht, Springer, pp. 77-84.
, 1974b, Whitehead's categoreal scheme and other papers, Springer, Dordrecht.
, 1972, On Kant, Frege, analyticity and the theory of reference, in L. White Beck (ed.), Proceedings of the Third international Kant congress, Dordrecht, Springer, pp. 407-414.
, 1969a, On events and the calculus of individuals, in L. Gabriel (ed.), Sektionen I-IV, Freiburg-Basel-Wien, Herder, pp. 202-208.