Business Statistics / 
Downing , Douglas ; Clark Jeffrey  
 - 2nd ed. 
 - USA:  Barron's Educational Series , Inc.,   1992. 
 - xiv,451 p,: 
<br/><br/><label>ISBN: </label>0812013840 
<br/><br/><label>LC Class. No.: </label>HF1017  / .D68  1992