Blankertz Donald F, and others <br/><br/>
Cases and problems in marketing research 

 -  1944 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Marketing
<br/><br/><label>Dewey Class. No.: </label>X:51y7, J4