Irala, Narciso <br/><br/>
Mental Efficiency Without Fatigue 

 - Mumbai  Better Yourself Books  1988 
 - 150p 
<br/><br/> includes index and biblioraphy 
<br/><br/><label>ISBN: </label>8171080170     100 
<br/><br/><label>Dewey Class. No.: </label>O28  / Ir120