Groningse doopsgezinden » Sources » http://familytreemaker.genealogy.com/users/w/o/l/Hindrik-Wolda/GENE8-0073.html; "Doopsgezinde families in het Oldambt 1520-1811" van S. H. Abels (deel 3); "Peter Harckes en zijn nakomelingen (tot ca. 1700)" van A. van der Laan
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