Cita APA (7th ed.)

Quercia, V., & O'Reilly, T. (1993). X Window system: User's guide for X11 release 5. O'Reilly.

Cita Chicago (17th ed.)

Quercia, Valerie, i Tim O'Reilly. X Window System: User's Guide for X11 Release 5. Sebastopol: O'Reilly, 1993.

Cita MLA (9th ed.)

Quercia, Valerie, i Tim O'Reilly. X Window System: User's Guide for X11 Release 5. O'Reilly, 1993.