Command language directions. 
edited by David Beech 
 - Amsterdam:  North-Holland publishing  1980 
 - viii, 424p.: ill. 
<br/><br/><label>ISBN: </label>444854509 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Programming Language (Electronic computers)--congresses
<br/><br/><label>LC Class. No.: </label>QA 76.7