Barnes, Ralph M. <br/><br/>
Motion and time study / 
Ralph M. Barnes 
 - 4th ed. 
 - New York :  John Wiley & Sons,  1960 
 - 665 p. :  ill. ;  23 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Motion study<br/>Time