Webb, John W Programmable logic controllers principles and applications - 5th ed. - New Delhi Prentice - Hall of India 2003 - xv, 460 p. ISBN: 9788120323087 Subjects--Topical Terms: AUTOMATIC CONTROL ENGINEERINGCONTROL ENGINEERINGControl systemsLOGIC CONTROLLERS Dewey Class. No.: 681.5 / WEB