OPPERMANN, Edward B. PLANE, Donald R. <br/><br/>
BUSINESS AND ECONOMIC STATISTICS 

 - 3rd Ed. 
 -  Business Publications Inc., Texas   1986 
<br/><br/><label>ISBN: </label>0 256 03432 X 
<br/><br/><label>Dewey Class. No.: </label>330.015 195  / PLA/B