Mennonites from Groningen » Sources » www.koolman.org; http://groningen.ngv.nl/Afdelingsblad/vragen/vragen1998.html; "Doopsgezinde families in het Oldambt 1520-1811" van S. H. Abels (deel 1 en 2); "Geschiedenis der doopsgezinden in het Oldambt 1577-1811" van S. H. Abels
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