Riso, Don Richard <br/><br/>
Understanding the Enneagram:  the practical guide to personality types 

 - Boston:  Houghton Mifflin Company,  c1990. 
 - 288 p. 
<br/><br/><label>ISBN: </label>395521483 
<br/><br/><label>Dewey Class. No.: </label>CIR 155.26 R4 1990  / 4842