Barnes, Ralph M. <br/><br/>
Work sampling 
by Ralph M. Barnes 
 - 2nd ed. 
 - New York  John Wiley  1966 
 - 283p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Time and motion study
<br/><br/><label>Dewey Class. No.: </label>T83 B263/66