Asher, Herbert B. <br/><br/>
Causal modeling / 
Herbert B. Asher. 
 - London :  Sage Publications,  1976. 
 - 80 p. :  illus.,  20 cm. 
<br/><br/> Quantitative applications in the social sciences. 
<br/><br/><label>Dewey Class. No.: </label>300.18  / ASH N76C