1. “Electronic Digital Computers.”;Alt,1958
2. History and summary of FORTRAN standardization development for the ASA
3. Backus, J. W., et al., Fortran Programmer's Reference Manual. Form 32–7026-1, International Business Machines Machines, 1958.
4. “Finite-State Languages.”;Bar-Hillel,1958
5. “On Formal Properties of Simple Phrase Structure Grammars.”;Bar-Hillel,1960