McHugh, J. (1980). Alexander Holley and the makers of steel. Baltimore: The Johns Hopkins University Press.
शिकागो स्टाइल उद्धरणMcHugh, Jeanne. Alexander Holley and the Makers of Steel. Baltimore: The Johns Hopkins University Press, 1980.
एमएलए उद्धरणMcHugh, Jeanne. Alexander Holley and the Makers of Steel. Baltimore: The Johns Hopkins University Press, 1980.
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