An Open Group specification that was compliant with several UNIX-based specifications including XPG3, XPG4, SVID and AT&T source code. UNIX 93 was closed by X/Open in 1996. See UNIX 95, Single UNIX Specification and Open Group.
"UNIX 93." YourDictionary, n.d. Web. 24 May 2018. <http://www.yourdictionary.com/unix-93>.
UNIX 93. (n.d.). Retrieved May 24th, 2018, from http://www.yourdictionary.com/unix-93