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शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPape, Helmut. "Peirce and His Followers: Helmut Pape." [Semiotik, 2].(1998) .
एमएलए (8वां संस्करण) प्रशस्ति पत्रPape, Helmut. "Peirce and His Followers: Helmut Pape." [Semiotik, 2].(1998), .
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