Não informado. (1972). Bulletin of the Section of Logic. Polish Academy of Sciences, Institute of Philosophy and Sociology.
Chicago-referens (17:e uppl.)Não informado. Bulletin of the Section of Logic. Warszawa: Polish Academy of Sciences, Institute of Philosophy and Sociology, 1972.
MLA-referens (8:e uppl.)Não informado. Bulletin of the Section of Logic. Polish Academy of Sciences, Institute of Philosophy and Sociology, 1972.
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