APA (7th ed.) Citation

(1987). Unix system V: User's guide (2nd ed.). Prenrice Hall.

Chicago Style (17th ed.) Citation

Unix System V: User's Guide. 2nd ed. Englewood Cliffs: Prenrice Hall, 1987.

MLA (9th ed.) Citation

Unix System V: User's Guide. 2nd ed. Prenrice Hall, 1987.