Margrieta Roubos en tant qu·Äôentrâ©e de Frederika Groos, "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:QL7G-RVVV : 22 August 2017), Margrieta Roubos in entry for Frederika Groos, Birth 26 Apr 1811, De Werken en Sleeuwijk, North Brabant, Netherlands; from database,
openarchives (https://www.openarch.nl : 2016); citing De Werken en Sleeuwijk, archive 50, inventory number 8816, record number 26; ; Brabants Historisch Informatie Centrum.