Quercia, V., & O'Reilly, T. (1990). X Window System user's guide. O'Reilly & Associates.
Chicago Style (17th ed.) CitationQuercia, Valerie, and Tim O'Reilly. X Window System User's Guide. Sebastopol, CA: O'Reilly & Associates, 1990.
MLA (9th ed.) CitationQuercia, Valerie, and Tim O'Reilly. X Window System User's Guide. O'Reilly & Associates, 1990.
Warning: These citations may not always be 100% accurate.