650 Chronology, IBM Corporation, http://www-03.ibm.com/ibm/history/exhibits/650/650_ch1.html2013年6月16日閲覧, "Refinement of the concepts and engineering design of the eventual production 650 system were carried out in the early-1950s, principally at IBM's laboratory in Endicott, N.Y., under the direction of Frank E. Hamilton, Ernest S. Hughes, Jr., and James J. Troy, who were the chief inventors."
