APA (7th ed.) Citation

Israel, E., & Fortune, E. (1992). The X-Window system server: X version 11, release 5. Digital Press.

Chicago Style (17th ed.) Citation

Israel, Elias, and Erik Fortune. The X-Window System Server: X Version 11, Release 5. Bedford, MA: Digital Press, 1992.

MLA (9th ed.) Citation

Israel, Elias, and Erik Fortune. The X-Window System Server: X Version 11, Release 5. Digital Press, 1992.