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3. R. Seising, The Fuzzification of Systems. The Genesis of Fuzz Set Theory and Its Intitial Applications–Developments up to the 1970s. (Studies in Fuzziness and Soft Computing 216) Springer-Verlag. (German edition: Die Fuzzifizierung der Systeme. Die Entstehung der Fuzzy Set Theorie und ihrer ersten Anwendungen - Ihre Entwicklung bis in die 70er Jahre des 20. Jahrhunderts. Stuttgart: Franz Steiner Verlag (Boethius: Texte und Abhandlungen zur Geschichte der Mathematik und der Naturwissenschaften Band 54)), 2007.
4. Elementy teorii poznania, logiki formalnej i metodologii nauk;Kortabiński,1929