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2. Hearings on automation and technological change, Subcommittee on Economic Stabilization of the Joint Committee on the Economic Report, US Congress, October 14–28 (1955)
3. W. Buckingham: Automation: Its Impact on Business and People (The New American Library, New York 1961)
4. J.G. Truxal: Control Engineersʼ Handbook: Servomechanisms, Regulators, and Automatic Feedback Control Systems (McGraw Hill, New York 1958)
5. M.P. Groover: Automation, Production Systems, and Computer-Integrated Manufacturing, 3rd edn. (Prentice Hall, Englewood Cliffs 2007)