Lopker, John. <br/><br/>
Pictures of personality :guide to the four human natures/ 
John Lopker 
 - Los Angeles :  Typology,  2000. 
 - 200 p. :  ills ;  24 cm. 
<br/><br/><label>ISBN: </label>0970581009 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Typology <br/>Psychology
<br/><br/><label>Dewey Class. No.: </label>155.2