Delens, A. H. R <br/><br/>
Principles of market research 
by A. H. R. Delens 
 - 2nd ed. 
 - London  Crosby Lockwood Staples  1950 
 - 254 p. : ill. ; 24 cm Ta 
<br/><br/><label>ISBN: </label>0258966807 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Marketing research