Ullman, Jeffrey D <br/><br/>
Principles of database systems 

 - 2nd ed. 
 - New Delhi  Galgotia  1984 
 - vii, 484 p. 
<br/><br/><label>ISBN: </label> RS55 
<br/><br/><label>Dewey Class. No.: </label>001.6 U6P