Barnes, Ralph M. <br/><br/>
Motion and time study design and measurement of work 

 - 7th ed. 
 - New York  John Wiley & Sons  1980 
 - xi, 689p. 
<br/><br/><label>ISBN: </label>9814-12-618-7 
<br/><br/><label>Dewey Class. No.: </label>65.015.14  / BAR