Barbour, Edna Hollar <br/><br/>
PL/I, a self-instructional manual 
Edna H. Barbour. 
 - London  Macmillan Co.  1970 
 - vi, 301 p.  illus. 
<br/><br/> Includes index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>PL/I (Computer program language)<br/>Electronic digital computers--Programming.