Clocksin, W.F.. <br/><br/>
Programming in Prolog /  

 - Third Rev. Ed. /  
 - New Delhi-17 :   Narosa Publishing House ,   1989 
 - p281 :  
<br/><br/><label>ISBN: </label>81-85198-15-2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Prolog
<br/><br/><label>Dewey Class. No.: </label>Bv  / M7C;1