Introduction to work study/2e 

 - 2nd ed. 
 - Geneva  International labour office  1969 
 - xix, 436p. 
<br/><br/><label>Subjects--Index Terms: </label>Productivity and work study  productivity in the individual  work study 
<br/><br/><label>Dewey Class. No.: </label>658.54  / ILO