Datta, S <br/><br/>
Documentation and Information Services 

 - Hyderabad  Andrapradesh Open University  1985 
 - 168 
<br/><br/> Complimentory copy recieved from K.N Latha Librarian S.G CPRI 
<br/><br/><label>Universal Decimal Class. No.: </label>025.5  / DAT.85