conversaciones

http://www.progressivepractices.com/articles/Botkin_Excerpt_Cons_3.pdf

http://translate.google.com/translate?hl=es&sl=en&u=http://www.progressivepractices.com/publications.htm&sa=X&oi=translate&resnum=4&ct=result&prev=/search%3Fq%3DDr.%2BJim%2BBotkin%26start%3D10%26hl%3Des%26sa%3DN

http://www.progressivepractices.com/publications.htm

http://www.newmango.com/01iftf/henschel.html

http://translate.google.com/translate?hl=es&sl=en&u=http://www.newmango.com/01iftf/henschel.html&sa=X&oi=translate&resnum=9&ct=result&prev=/search%3Fq%3DDr.%2BJim%2BBotkin%26start%3D10%26hl%3Des%26sa%3DN