1. A Programming Language for Information Processing on Automatic Data Processing Systems, CACM 7.10, (1964), p. 591
2. Jensen and Wirth Pascal User Manual and Report, 2nd Edition, Springer Verlag (1974)
3. The Programming Language Ada, Reference Manual, Lecture Notes in Comp. Science, Springer-Verlag (1983)
4. ISO 1539–1980 Programming Language Fortran, ISO, New York, 1980
5. Fortran90, May 1991, ISO/IEC 1539:1991(E)