Indian Standards Institution <br/><br/>
Indian standard guide for the use of quartz crystal units for frequency control and selection  piezoelectric devices for frequency control and selection sectional committee, LTDC 12 

 - Indian Standards Institution, New Delhi  1981 
 - 40 
<br/><br/><label>Dewey Class. No.: </label>IS:2935-1980 548.85 I.S.I.