APA (7th ed.) Citation

Kelly-Bootle, S. (1994). Understanding UNIX (2nd ed.). Sybex.

Chicago Style (17th ed.) Citation

Kelly-Bootle, Stan. Understanding UNIX. 2nd ed. San Francisco: Sybex, 1994.

MLA (9th ed.) Citation

Kelly-Bootle, Stan. Understanding UNIX. 2nd ed. Sybex, 1994.