United Nations. Industrial Development Organization, V. (1969). Studies in the development of plastics industries (Petro-chemical ...No.4). United Nations.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUnited Nations. Industrial Development Organization, Vienna. Studies in the Development of Plastics Industries (Petro-chemical ...No.4). United Nations, 1969.
एमएलए (9वां संस्करण) प्रशस्ति पत्रUnited Nations. Industrial Development Organization, Vienna. Studies in the Development of Plastics Industries (Petro-chemical ...No.4). United Nations, 1969.
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