• 

  Hellner

  https://web.archive.org/web/20140201210340/http://staff-www.uni-marburg.de/~fischerw/Hellner.htm

  Keine Beschreibung vorhanden.

• 

  DEA - Das Elektronische Archiv

  https://web.archive.org/web/20180704182717/http://www.dearchiv.de/php/dok.php?archiv=bla&brett=B68_08&fn=MARBURG.868&menu=b1968

  bla 68/08 Marburger Manifest

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