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References
- 1 2 General Electric Process Computer Business Section (1966). GE/PAC 4000 Systems Manual (PDF). Retrieved June 7, 2020.
{{cite book}}:|last1=has generic name (help) - ↑ General Electric Process Computer Business Section (1965). GE/PAC 4000 Programming Manual (PDF). Retrieved June 7, 2020.
{{cite book}}:|last1=has generic name (help) - ↑ General Electric (1965). "Industry's most advanced compact computer for process control, GE/PAC 4020". Computer History Museum. Retrieved June 9, 2020.
- ↑ General Electric (Oct 1963). GE/PAC 4000 Small Process Computer (PDF). Retrieved June 8, 2020.
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