Rosenbaum, Paul R. <br/><br/>
Observational studies  / 

 - 2nd 
 - New York:  Springer-Verlag,  2002 
 - xiv, 375p. Bibl., Index. 
 - Springer series in Statistics .
<br/><br/><label>ISBN: </label>0387989676 
<br/><br/><label>Dewey Class. No.: </label>519.50184  / R813.OS