Clayton, Albert E. <br/><br/>
The Performance and Design of Direct Current Machines 

 - 3rd ed. 
 - London  The English Language book society  1971 
 - xx, 516 p. 
<br/><br/> Includes Index 
<br/><br/><label>ISBN: </label>0 273 40186 6 
<br/><br/><label>Dewey Class. No.: </label>SC/ST D663,6:4 J9; 18