Costello, Mike <br/><br/>
Advanced programming for the 16K ZX81 
Mike Costello 
 - London  MacMillan  1983 
 - viii, 126p. ill. 24cm 
 - Macmillan computing books .
<br/><br/><label>ISBN: </label>0333345908 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sinclair ZX81 (Computer)--Programming