Ebert, Andreas, ed.; Kustenmacher, Marion, ed. & Heinegg, Peter, trans. <br/><br/>
Experiencing the Enneagram   

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 - New York  Crossroad Publishing Company  1992 
 - 256 p. 
 -   .
<br/><br/><label>ISBN: </label>0824512014 
<br/><br/><label>Dewey Class. No.: </label>155.2  / E16