Stata programming reference manual :  release 12. 
 Stata release 12:  programming  Stata 12 : programming 

 - College Station, Tex. :  StataCorp LP,  c2011. 
 - ix, 486 p. ;  24 cm. 
<br/><br/> "A Stata Press publication."  Includes index. 
<br/><br/><label>ISBN: </label>9781597180917 1597180912 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Statistics<br/>Social sciences
<br/><br/><label>Dewey Class. No.: </label>005 STA 2011 A002 Or.