Hillechien Kasemir in entry for Jurjen Beuker and Hebeltje Kok, "Netherlands, Archival Indexes, Vital Records, 1600-2000"
"Nederland, Indexen van de Archieven, Primaire Archiefstukken (BS en DTB), 1600-2000," database,
FamilySearch (
https://familysearch.org/ark:/61903/1:1:QL5P-KGTC : 6 October 2017), Hillechien Kasemir in entry for Jurjen Beuker and Hebeltje Kok, Marriage 29 Apr 1876, Onstwedde, Groningen, Nederland; from database,
openarchives (https://www.openarch.nl : 2016); citing Onstwedde, archive , inventory number , record number 20; ; AlleGroningers.