Johnson, W. <br/><br/>
Fifty subroutines for the sinclair spectrum  [Books]. 
W. Johnson. 
 - Wilmslow, Chesdire  Sigma Technical Press.  1983 
 - Pages: 128 
<br/><br/><label>ISBN: </label>0905104978  0.00 
<br/><br/><label>Subjects--Personal Names: </label><br/>Sinclair ZX spectrum (Computer) -- Programming.
<br/><br/><label>Dewey Class. No.: </label>QA/76.8  / JOH