Ellzey, Roy S. <br/><br/>
Computer systems software :  the programmer/machine interface / 
by Roy S. Ellzey. 
 - Chicago :  Science Research Associates,  c1987. 
 - xi, 292 p. : 
<br/><br/><label>ISBN: </label>057421965x 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Systems software.
<br/><br/><label>Dewey Class. No.: </label>005.4  / Co