Introduction to work study. 

 - 3rd ed. 
 - Geneva :  International labour office,  c1979. 
 - xiv, 442p. :  Ill. 
 - Work study .
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>922101939x 
<br/><br/><label>LC Class. No.: </label>T60  / .I8