Boyd H W <br/><br/>
Marketing research 
Boyd H W And Others 
 - Ed 4 
 - USA Homewood  USA Homewood, Richard D. Irwin  1977 
 - 692p 
<br/><br/><label>ISBN: </label>0-256-01838-3 
<br/><br/><label>Source: </label>Textbook