Retherford, Robert D. <br/><br/>
Statistical models for causal analysis 

 - New York  John Wiley &Sons  1993 
 - xiv,258p. 
<br/><br/><label>ISBN: </label>0-471-55802-8 
<br/><br/><label>Dewey Class. No.: </label>519.24  / RET