APA (7th ed.) Citation

Information technology - portable operating system interface (POSIX): International standard ISO/IEC 9945-1: 1990 ; IEEE std. 1003.1-1990 ; (revision of IEEE std. 1003.1-1988). IEEE.

Chicago Style (17th ed.) Citation

Information Technology - Portable Operating System Interface (POSIX): International Standard ISO/IEC 9945-1: 1990 ; IEEE Std. 1003.1-1990 ; (revision of IEEE Std. 1003.1-1988). New York, NY: IEEE.

MLA (9th ed.) Citation

Information Technology - Portable Operating System Interface (POSIX): International Standard ISO/IEC 9945-1: 1990 ; IEEE Std. 1003.1-1990 ; (revision of IEEE Std. 1003.1-1988). IEEE.