Stata longitudinal/panel-data reference manual :  release 9. 

 - College Station, Tex. :  StataCorp LP,  1985, 2005. 
 - iii, 349 p. : 
<br/><br/><label>ISBN: </label>CSRD1859 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Longitudinal method
<br/><br/><label>Dewey Class. No.: </label>005.55  / St