Singh,N.K. <br/><br/>
Encyclopaedia of the world Scientists (Vol-3)D to E   

 - 1st /   2004. 
 - Delhi:  APH Publishing Corporation.  2004. 
 - 962p:  28cm. 
<br/><br/><label>Subjects--Personal Names: </label><br/>Encyclopaedia, World Scientists.