APA (7th ed.) Citation

Quercia, V., & O'Reilly, T. (1993). X Window system user's guide: For X11 release 5 (4. ed., rev. to reflect release 5.). O'Reilly.

Chicago Style (17th ed.) Citation

Quercia, Valerie, and Tim O'Reilly. X Window System User's Guide: For X11 Release 5. 4. ed., rev. to reflect release 5. Sebastopol, CA: O'Reilly, 1993.

MLA (9th ed.) Citation

Quercia, Valerie, and Tim O'Reilly. X Window System User's Guide: For X11 Release 5. 4. ed., rev. to reflect release 5. O'Reilly, 1993.