APA (7th ed.) Citation

UNIX System Laboratories. (1991). System V interface definition (3rd ed.). UNIX Press.

Chicago Style (17th ed.) Citation

UNIX System Laboratories. System V Interface Definition. 3rd ed. [United States]: UNIX Press, 1991.

MLA (9th ed.) Citation

UNIX System Laboratories. System V Interface Definition. 3rd ed. UNIX Press, 1991.

Warning: These citations may not always be 100% accurate.