Não informado. (1977). Plastics and Rubber International. Plastics and Rubber International.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Plastics and Rubber International. London: Plastics and Rubber International, 1977.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Plastics and Rubber International. Plastics and Rubber International, 1977.
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