Não informado. World calendar of forthcoming meetings. Iron and Steel Institute.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. World Calendar of Forthcoming Meetings. London: Iron and Steel Institute.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. World Calendar of Forthcoming Meetings. Iron and Steel Institute.
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