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.
Precaución: Estas citas no son 100% exactas.