APA (7th ed.) Citation

(1985). X-OPEN portability guide. Elsevier.

Chicago Style (17th ed.) Citation

X-OPEN Portability Guide. Amsterdam u.a: Elsevier, 1985.

MLA (9th ed.) Citation

X-OPEN Portability Guide. Elsevier, 1985.

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