Cunningham, John E.  1923-. <br/><br/>
Security electronics / 
by John E. Cunningham. 
 - 3rd ed. 
 - Indianapolis, Ind. :  H. W. Sams,  1983. 
 - 255 p. :  ill. ;  22 cm. 
<br/><br/>Includes index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electronic security systems.