WALKER, J. R. (1976). Modern metalworking: Materials, tools and procedures. The Goodheart-Willcox.
Lua i Stíl Chicago (17ú heag.)WALKER, John R. Modern Metalworking: Materials, Tools and Procedures. Illinois: The Goodheart-Willcox, 1976.
Lua MLA (9ú heag.)WALKER, John R. Modern Metalworking: Materials, Tools and Procedures. The Goodheart-Willcox, 1976.
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