Thakur, B R., <br/><br/>
Vector Analysis 
by B R Thakur, S P Nigam, H C  Sinha & J C Sharma 
 - 3rd ed   Rep. 
 - Agra:  Ram Prasad & Sons,  1970. 
 - 184p.:  10cm. 
<br/><br/>Answer. 
<br/><br/><label>Subjects--Index Terms: </label>Geometry.Mathematics 
<br/><br/><label>Dewey Class. No.: </label>516.182