P. S. S. C. physics : teacher's resource book and guide; part 3/ 
NCERT 
 - New Delhi:  NCERT,  1964 
 - iv, III-14(1)p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Physics-Guide Books
<br/><br/><label>Dewey Class. No.: </label>530.1 NAT-P