Dietel,H.M, Deitel ,P.J, and Nieto,T.R <br/><br/>
Visual Basic 6; How to Programme 

 - New jersey  Prentice -Hall  1999 
 - LI+1015p 
<br/><br/><label>Universal Decimal Class. No.: </label>681.3.066  / VIS DEI.99