Critchley T A Open systems: the reality - New York Prentice Hall 1993 - xxxiii, 390p - BSC practitioner series . Index 373-390p ISBN: 0130307351 (pbk) Standard No.: 4089 Source: Textual Subjects--Topical Terms: Operating systemsComputer science Dewey Class. No.: D65,8(B)91, N3