British Standards Institution. (1981). Methods for analysis and testing of coal and coke. British Standards Institution.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBritish Standards Institution. Methods for Analysis and Testing of Coal and Coke. London: British Standards Institution, 1981.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBritish Standards Institution. Methods for Analysis and Testing of Coal and Coke. British Standards Institution, 1981.
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