Quercia, V., & O'Reilly, T. (1990). X Window System user's guide. O'Reilly & Associates.
Lua i Stíl Chicago (17ú heag.)Quercia, Valerie, agus Tim O'Reilly. X Window System User's Guide. Sebastopol, CA: O'Reilly & Associates, 1990.
Lua MLA (9ú heag.)Quercia, Valerie, agus Tim O'Reilly. X Window System User's Guide. O'Reilly & Associates, 1990.
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