Watt .J <br/><br/>
Applied fourth generation languages/ 
J. Watt 
 - England  Sigma press  1987 
 - viii, 155p,   pbk 
<br/><br/><label>ISBN: </label>1850589618 
<br/><br/><label>LC Class. No.: </label>QA.76.7.W3 1987