APA (7th ed.) Citation

AT & T Bell Laboratories. (1986). The UNIX system user's guide. Prentice-Hall.

Chicago Style (17th ed.) Citation

AT & T Bell Laboratories. The UNIX System User's Guide. Englewood Cliffs, N.J.: Prentice-Hall, 1986.

MLA (9th ed.) Citation

AT & T Bell Laboratories. The UNIX System User's Guide. Prentice-Hall, 1986.