Stata data- management reference manual 

 - New York  Stata Press  2011 
 - v,636p.  23cm. 
<br/><br/><label>ISBN: </label>10: 1 597180807 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Data management
<br/><br/><label>LC Class. No.: </label>HA32.S73 2011  / StataCorp LP