Veatch, Henry C. <br/><br/>
Ruby  the programming language 
Jules J. Berman 
 - New York,  McGraw-Hill  c[1971] 
 - x, 470 p.  illus.  23 cm. 
<br/><br/>Includes index - Bibliography: p. 462. 
<br/><br/><label>ISBN: </label>0070673829 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Digital counters.<br/>Pulse circuits.<br/>Switching circuits.