Billington, D. P. (1966). The innovators: The engineering pioneers who made America modern. New York: Wiley.
शिकागो स्टाइल उद्धरणBillington, David P. The Innovators: The Engineering Pioneers Who Made America Modern. New York: Wiley, 1966.
एमएलए उद्धरणBillington, David P. The Innovators: The Engineering Pioneers Who Made America Modern. New York: Wiley, 1966.
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