Roberts, D. D. (1973). The existential graphs of Charles S. Peirce. Mouton.
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Tohutoru Kātū Chicago (17th ed.)
Roberts, Don D. The Existential Graphs of Charles S. Peirce. The Hague: Mouton, 1973.
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Tohutoro MLA (9th ed.)
Roberts, Don D. The Existential Graphs of Charles S. Peirce. Mouton, 1973.
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