APA (7th ed.) Citation

X/Open Group. (1997). Preliminary specification: Event management services. The Open Group.

Chicago Style (17th ed.) Citation

X/Open Group. Preliminary Specification: Event Management Services. Berkshire, UK: The Open Group, 1997.

MLA (9th ed.) Citation

X/Open Group. Preliminary Specification: Event Management Services. The Open Group, 1997.

Warning: These citations may not always be 100% accurate.