ZIEMBINSKI, Z. Practical logic. With the appendix on 'Deontic logic' by Z. Ziemba. Translated from the Polish by L. Ter-Oganian. Dordrecht, Reidel, 1976.

ZWART, P.J. Causaliteit. Assen, Van Gorcum, 1967.

ZWICKER, E., TERHARDT, E., (EDS.) Facts and models in hearing. Proceedings of the Symposium on Psychophycial models and physiological facts in hearing held at Tutzing, Oberbayern, Federal Republic of Germany, april 22 - 26, 1974. Berlin, Springer, 1974.