Wooldridge, Jeffrey <br/><br/>
Econometric analysis of cross section and panel data / 2nd ed. 

 -  MIT Press, 
<br/><br/> Prism Books 
<br/><br/><label>ISBN: </label>9 780 262 232 586 
<br/><br/><label>Dewey Class. No.: </label>658.4033 WOO