Walker, J. R. (1970). Modern metalworking: Materials, tools, and procedures ([3rd ed.].). Goodheart-Willcox Co..

Walker, John R. Modern Metalworking: Materials, Tools, and Procedures. [3rd ed.]. South Holland, Ill.: Goodheart-Willcox Co., 1970.

Walker, John R. Modern Metalworking: Materials, Tools, and Procedures. [3rd ed.]. Goodheart-Willcox Co., 1970.