Gimpel, J. (1976). The medieval machine: The industrial revolution of the Middle Ages. New York: Penguin Books.
शिकागो स्टाइल उद्धरणGimpel, Jean. The Medieval Machine: The Industrial Revolution of the Middle Ages. New York: Penguin Books, 1976.
एमएलए उद्धरणGimpel, Jean. The Medieval Machine: The Industrial Revolution of the Middle Ages. New York: Penguin Books, 1976.
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