Bergen, Annie Van. <br/><br/>
Task interruption   
by Annie Van Bergen 
 - Amsterdam  North-Holand  1968 
 - vii, 341p.  incl. app., bibl., ind. 
<br/><br/><label>LCCN: </label>68-21425 
<br/><br/><label>Dewey Class. No.: </label>150.1943  / N68