1. Walter Andrew Shewhart
2. Walter A. Shewhart, 1891-1967;Deming;Rev. Internat. Statist. Inst,1968
3. Biography: Shewhart, Walter A. (1891-1967);Deming;International Encyclopedia of Statistics,1978
4. The economic design of X-bar control charts used to maintain current control of a process;Duncan;J. Amer. Statist. Ass,1956