APA (7th ed.) Citation

(1988). ULTRIX software source book {Catalogue} (4th edition.).

Chicago Style (17th ed.) Citation

ULTRIX Software Source Book {Catalogue}. 4th edition. 1988.

MLA (8th ed.) Citation

ULTRIX Software Source Book {Catalogue}. 4th edition. 1988.

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