Delens A. H. R. <br/><br/>
Principles of market research / 
by A. H. R. Delens. 
 - ed. 
 - London :  Crosby Lockwood & Sons,  c1950. 
 - 254 p. 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>0258966807 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Marketing.
<br/><br/><label>LC Class. No.: </label>HF5415.2  / .D44