Reference Division Central Office of Information. (1974). Steel. London: Her Majesty's Stationery Office.
शिकागो स्टाइल उद्धरणReference Division Central Office of Information. Steel. London: Her Majesty's Stationery Office, 1974.
एमएलए उद्धरणReference Division Central Office of Information. Steel. London: Her Majesty's Stationery Office, 1974.
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