The human factors of productivity in Africa :  a preliminary surve y. 

 - 2d ed. 
 - Brazzaville,  1960. 
 - 156 p. :  diagr. ;  24 cm. 
<br/><br/>Includes bibliographical references (p. 147-156). 
<br/><br/><label>LCCN: </label>61-003691 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Labor productivity--Africa.
<br/><br/><label>Dewey Class. No.: </label>331.096