Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Quercia, Valerie, y Tim O'Reilly. X Window System User's Guide: For X11, Release 5. 4th ed. Sebastopol, California: O'Reilly, 1993.

Cita MLA (9a ed.)

Quercia, Valerie, y Tim O'Reilly. X Window System User's Guide: For X11, Release 5. 4th ed. O'Reilly, 1993.