Não informado. (1977). World cement technology. Cement and Concrete Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. World Cement Technology. London: Cement and Concrete Association, 1977.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. World Cement Technology. Cement and Concrete Association, 1977.
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