Walker, Philip Electronic security systems : better ways to crime prevention / Philip Walker. - 2nd ed. - London ; Boston : Butterworths, 1988. - 287 p. : ill. ; 25 cm. Part 1: Systems (Page-1), Part 2: Equipment (Page-91), Part 3: Implementation (Page-239). ISBN: 0408026359 : LCCN: 88019938 Subjects--Topical Terms: Electronic security systems. Dewey Class. No.: 621.3892,WAL