Langley, Billy C. <br/><br/>
Electromechanical and electronic controls for HVAC/R / 
Billy C. Langley 
 - Upper Saddle River, NJ.:  Prentice Hall,  1999 
 - vii, 438 p.:  ill.;  25 cm. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>0139075690 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Refrigeration and refrigerating machinery--Automatic control<br/>Air conditioning--Control<br/>Heating--Control