Singh, Harnam . <br/><br/>
Principles of Light /  Textual Documents 
Harnam Singh. 
 - 2nd ed. / 
 - New Delhi :  S. Chand & Company ,  1974. 
 - 441p. :  ill ;  22cm . 
<br/><br/><label>Subjects--Index Terms: </label>Light G-Physics 
<br/><br/><label>Dewey Class. No.: </label>535  / Si 61 Pr