WALKER, J. R. (1976). Modern metalworking: Materials, tools and procedures. The Goodheart-Willcox.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWALKER, John R. Modern Metalworking: Materials, Tools and Procedures. Illinois: The Goodheart-Willcox, 1976.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWALKER, John R. Modern Metalworking: Materials, Tools and Procedures. The Goodheart-Willcox, 1976.
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