Computer Museum History, Historical Zuse-Computer Z23, restored by the Konrad Zuse Schule in Hünfeld, for the Computer Museum History Center in Mountain View (California) USA
Backus, J. W.; Bauer, F. L.; Green, J.; Katz, C.; McCarthy, J.; Perlis, A. J.; Rutishauser, H.; Samelson, K. et al. (May 1960). Naur, Peter. ed. Report on the Algorithmic Language ALGOL 60. Copenhagen. doi:10.1145/367236.367262. ISSN0001-0782
Perlis, A.J.; Samelson, K. (1958), “Preliminary report: international algebraic language”, Communications of the ACM1 (12): 8-22, doi:10.1145/377924.594925
Knuth, Donald E. (1964). “Backus Normal Form vs Backus Naur Form”. Communications of the ACM7 (12): 735–736. doi:10.1145/355588.365140.
Backus, J. W.; Bauer, F. L.; Green, J.; Katz, C.; McCarthy, J.; Perlis, A. J.; Rutishauser, H.; Samelson, K. et al. (May 1960). Naur, Peter. ed. Report on the Algorithmic Language ALGOL 60. Copenhagen. doi:10.1145/367236.367262. ISSN0001-0782