APA (7th ed.) Citation

(1990). Xlib reference manual: For version 11 of the X Window system (5. printing, minor rev.). O'Reilly.

Chicago Style (17th ed.) Citation

Xlib Reference Manual: For Version 11 of the X Window System. 5. printing, minor rev. Sebastopol, CA: O'Reilly, 1990.

MLA (9th ed.) Citation

Xlib Reference Manual: For Version 11 of the X Window System. 5. printing, minor rev. O'Reilly, 1990.