Não informado. (1973). Index of Conference Proceedings Received. British Library, Lending Division.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Index of Conference Proceedings Received. Boston, Inglaterra: British Library, Lending Division, 1973.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Index of Conference Proceedings Received. British Library, Lending Division, 1973.
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