Hughes, Joan Kirkby <br/><br/>
PL/1 structured programming / 
Joan K. Hughes 
 - 3rd ed. 
 - New York :  John Wiley & Sons, 
<br/><br/><label>ISBN: </label>0471837466 
<br/><br/><label>Subjects--Topical Terms: </label><br/>PL/1 (Computer program language)<br/>Structured programming