BLALOCK, Hubert. M <br/><br/>
Casual inferences in nonexperimental research 

 - New York  W.W. Norton  1961 
 - xii, 200 p. 
<br/><br/><label>ISBN: </label>393006425 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Research problems
<br/><br/><label>Dewey Class. No.: </label>1.4  / BLA