==Further reading==* Charles J. Bashe, Lyle R. Johnson, John H. Palmer, Emerson W. Pugh, "IBM's Early Computers" (MIT Press, Cambridge, 1986)* Steven Levy, ""==See also==*GM-NAA I/O*List of vacuum tube computers==References====External links==*Oral history interview with Gene Amdahl Charles Babbage Institute, University of Minnesota, Minneapolis.
* GM-NAA I/O* Charles J. Bashe, Lyle R. Johnson, John H. Palmer, Emerson W. Pugh, "IBM's Early Computers" (MIT Press, Cambridge, 1986)*Oral history interview with Gene Amdahl Миннеаполис, Миннесотский Университет, Институт Чарльза Бэббиджа.