2004ISO/IEC 9945-1:2003/Cor 1:2004 Information technology - Portable Operating System Interface (POSIX) - Part 1: Base Definitions; Technical Corrigendum 1
2003ISO/IEC 9945-1:2003 Information technology - Portable Operating System Interface (POSIX?) - Part 1: Base Definitions
2002ISO/IEC 9945-1:2002 Information technology - Portable Operating System Interface (POSIXę) - Part 1: Base definitions
1996ISO/IEC 9945-1:1996 Information technology - Portable Operating System Interface (POSIX) - Part 1: System Application Program Interface (API) [C language]
1990ISO/IEC 9945-1:1990 Information technology; portable operating system interface (POSIX); part 1: system application program interface (API) C language