Date, C. J. <br/><br/>
An introduction to database systems .-7th ed. 
C.J. Date. 
 - 7th ed. 
 - Reading, Mass. :  Addison-Wesley,  c2000. 
 - xxii, 938 p. :  ill. ; 
<br/><br/><label>ISBN: </label>0201385902 
<br/><br/><label>Subjects--Index Terms: </label>Database systems 
<br/><br/><label>Universal Decimal Class. No.: </label>681.3.02  / DAT'00