Womack, J. P. (1990). The Machine that Changed the World. Rawson Associates.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWomack, James P. The Machine That Changed the World. Rawson Associates, 1990.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWomack, James P. The Machine That Changed the World. Rawson Associates, 1990.
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