An introduction to database systems /  
C. J Date 
 - 6a. ed. 
 - Massachusetts :  Addison-Wesley,  1995 
 - 839 p. :    839 p. ; fig. ;    24 cm. 
<br/><br/><label>ISBN: </label>201824582 
<br/><br/><label>LC Class. No.: </label> / D 5 
<br/><br/><label>Universal Decimal Class. No.: </label>681.3