Sobell, M. G. (1984). A practical guide to the UNIX system. The Benjamin Cummings.
Lua i Stíl Chicago (17ú heag.)Sobell, Mark G. A Practical Guide to the UNIX System. Menlo Park: The Benjamin Cummings, 1984.
Lua MLA (9ú heag.)Sobell, Mark G. A Practical Guide to the UNIX System. The Benjamin Cummings, 1984.
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