Stata Corporation <br/><br/>
Stata programming reference manual   

 - Texas  Stata Press  2005 
 - 450p. 
 - Statistics, graphics and data management .
<br/><br/> "Stata - Release 9"   
<br/><br/><label>ISBN: </label>1597180009 
<br/><br/><label>Dewey Class. No.: </label>518.5425  / St797.SP