APA (7th ed.) Citation

Bell Telephone Laboratories. (1983). UNIX time-sharing system: UNIX programmer's manual (Rev. & exp. version.). Holt, Rinehart & Winston.

Chicago Style (17th ed.) Citation

Bell Telephone Laboratories. UNIX Time-sharing System: UNIX Programmer's Manual. Rev. & exp. version. New York: Holt, Rinehart & Winston, 1983.

MLA (9th ed.) Citation

Bell Telephone Laboratories. UNIX Time-sharing System: UNIX Programmer's Manual. Rev. & exp. version. Holt, Rinehart & Winston, 1983.