Langill,  A. W., Jr.  <br/><br/>
Control systems engineering. Vol.1 :   Automatic control systems engineering 

 - Englewood Cliffs, N. J. :   Prentice-Hall,   1965. 
 - xix, 376 p.  gráf. ilus.  tablas 
<br/><br/><label>Universal Decimal Class. No.: </label>681.5