Não informado. (1973). Plastics Engineering. Society of Plastics Engineers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Plastics Engineering. Brookfield, CT: Society of Plastics Engineers, 1973.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Plastics Engineering. Society of Plastics Engineers, 1973.
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