Lancaster, Don. <br/><br/>
Active-filter cookbook /  [Books]. 
by Don Lancaster.  
 - 1st ed. 
 - Indianapolis :   H. W. Sams,   1975. 
 - 240 p. :   ill. ;   22 cm. 
<br/><br/> Includes index. 
<br/><br/>Bibliography: p. 234. 
<br/><br/><label>ISBN: </label>0672211688 
<br/><br/><label>LCCN: </label>74033839 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electric filters, Active.