Edwin Mansfield <br/><br/>
Statistics for business and economics: problems, exercises, and case studies 

 - 4th ed. 
 -  W. W. Norton & company  1991 
 - 272 p 
<br/><br/><label>ISBN: </label>0- 393- 96052- 8 
<br/><br/><label>LC Class. No.: </label>HB 137 .S73/