Andhra Pradesh Open University <br/><br/>
Bibliography and Reference Source and Services 

 - Hyderabad  Andhra Pradesh Open University  1985 
 - p.177 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Physical Bibliography<br/>Enumerative Bibliography
<br/><br/><label>Dewey Class. No.: </label>028.7 A553B