Ferber, Robert, <br/><br/>
Research methods in economics & business / 
by Robert Ferber and P. J. Verdoorn. 
 - New York :  Macmillan,  1962. 
 - 573 pages :  illustrations ;  25 cm. 
<br/><br/>Includes bibliography. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economics--Research.