Johnson, R. H. (1972). The concept of existence in the concluding unscientific postscript. Nijhoff.
Citace podle Chicago (17th ed.)Johnson, Ralph Henry. The Concept of Existence in the Concluding Unscientific Postscript. The Hague: Nijhoff, 1972.
Citace podle MLA (9th ed.)Johnson, Ralph Henry. The Concept of Existence in the Concluding Unscientific Postscript. Nijhoff, 1972.
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