Hurley, Randle, <br/><br/>
The Sinclair ZX81:  programming for real applications/ 
Randle Hurley. 
 - London:  MacMillan,  1981. 
 - vi,162p:  ill;  24 cm.  
<br/><br/><label>ISBN: </label>0333329732 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Sinclair ZX81 (Computer)--Programming.