Radford, D. (1994). Building machines and what they do (1st U.S. paperback ed.). Candlewick Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRadford, Derek. Building Machines and What They Do. 1st U.S. paperback ed. Cambridge, Mass.: Candlewick Press, 1994.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRadford, Derek. Building Machines and What They Do. 1st U.S. paperback ed. Candlewick Press, 1994.
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