APA (7th ed.) Citation
(1987). X/OPEN Portability Guide: System V Specification Commands and Utilities. Elsevier.
Chicago Style (17th ed.) Citation
X/OPEN Portability Guide: System V Specification Commands and Utilities. Amsterdam: Elsevier, 1987.
MLA (9th ed.) Citation
X/OPEN Portability Guide: System V Specification Commands and Utilities. Elsevier, 1987.
Warning: These citations may not always be 100% accurate.