Não informado. (1952). Chemical and Process Engineering. Leonard Hill Technical Group.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Chemical and Process Engineering. London: Leonard Hill Technical Group, 1952.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Chemical and Process Engineering. Leonard Hill Technical Group, 1952.
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