1. ASCII
(1991) ISO/IEC 646:1991 Information technology -- ISO 7-bit coded character set for information interchange. ISO Geneva. ASCII (1991) ISO/IEC 646:1991 Information technology -- ISO 7-bit coded character set for information interchange. ISO Geneva.
2. IEEE
(1989) IEC 60559: 1989 Binary floating-point arithmetic for microprocessor Systems. Originally IEEE 754-1985. IEEE (1989) IEC 60559: 1989 Binary floating-point arithmetic for microprocessor Systems. Originally IEEE 754-1985.
3. Metcalf Michael Reid John and Cohen Malcolm (2004). Fortran 95/2003 explained. Oxford University Press. Metcalf Michael Reid John and Cohen Malcolm (2004). Fortran 95/2003 explained. Oxford University Press.
4. WG5 (2004) ISO/IEC 1539-1:2004(E) Information technology -- Programming languages -- Fortran - Part 1: Base language. ISO Geneva. WG5 (2004) ISO/IEC 1539-1:2004(E) Information technology -- Programming languages -- Fortran - Part 1: Base language. ISO Geneva.