Gill E T, Eric N Simons, . (1950). Modern Welding Technique. London: SIR Isaac Pitman & Sons Ltd.
Gill E T, Eric N Simons, . 1950. Modern Welding Technique. London: SIR Isaac Pitman & Sons Ltd.
Gill E T, Eric N Simons, . Modern Welding Technique. London: SIR Isaac Pitman & Sons Ltd. 1950.