Drucker , Peter F. <br/><br/>
The age of discontinuity :  Guidelines to our changing society / 
Peter F. Drucker. 
 - London :  Harper & Row, Publishers,  1969. 
 - 402 p. :  24 cm. 
<br/><br/> Includes Indexes. 
<br/><br/><label>ISBN: </label>0-06-011093-7 
<br/><br/><label>Dewey Class. No.: </label>309.104  / DRU