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* [http://www.edith.nl/telmie2/reforped/theory/theory.html Una breu biografia de Helen Parkhurst.] {{en}}
* [http://www.vlb-bayern.de/akzente/2003/07/ak030710.htm Helen Parkhurst i el seu Dalton Plan.] {{Webarchive|url=https://web.archive.org/web/20110927120018/http://www.vlb-bayern.de/akzente/2003/07/ak030710.htm |date=2011-09-27 }} {{de}}
* [http://www.stedelijkdalton.nl/Bezoekers/Dalton/HelenParkhurst/tabid/125/Default.aspx Vida i obra de Helen Parkhurst.] {{Webarchive|url=https://web.archive.org/web/20070927161624/http://www.stedelijkdalton.nl/Bezoekers/Dalton/HelenParkhurst/tabid/125/Default.aspx |date=2007-09-27 }} {{nl}}
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