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

 - 3rd ed. 
 - New Delhi  Narosa Publishing House  1981 
 - p.281 
<br/><br/><label>ISBN: </label>8185198152 
<br/><br/><label>Subjects--Topical Terms: </label> Syntax  Arithmetic  Accumulators  Horn Clauses 
<br/><br/><label>Dewey Class. No.: </label>621.3819642 C42P C1