On killing : the psychological cost of learning to kill in war and society 
revised edition, Lieutenant Colonel Dave Grossman 
 - Rev. ed 
 - New York  Back Bay Books  2009 
 - xxxvi, 378 p. ; 24 cm 
<br/><br/> Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9780316040938 
<br/><br/><label>Dewey Class. No.: </label>355.0019 GRO