Gaul W <br/><br/>
Classification as atool of research 

 - Holand  North  1986 
 - XIII, 502, 24 cm>  HB 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Research methods
<br/><br/><label>Dewey Class. No.: </label>001.42  / CLA