Hewson, Andrew D. <br/><br/>
Hints of tips for the ZX81 / 
Andrew D. Hewson. 
 - s.l. :  Hewson Consultants,  1981. 
 - 76 p. ;  23 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sinclair ZX81 (Computer)--Programming.