Barnes, Ralph M. <br/><br/>
Time study/4e 

 - 4th ed. 
 - London  Asia publishing house  1958 
 - xii, 665p. 
<br/><br/><label>Subjects--Index Terms: </label>Motion  operation analysis 
<br/><br/><label>Dewey Class. No.: </label>658.542 1  / BAR