Machiel Rogier in entry for Petronella Spek, "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:QLXF-DGNC : 23 August 2017), Machiel Rogier in entry for Petronella Spek, Death 17 Feb 1854, Bergen op Zoom, Noord-Brabant, Nederland; from database,
openarchives (https://www.openarch.nl : 2016); citing Bergen op Zoom, archive 50, inventory number 671, record number 23; ; Brabants Historisch Informatie Centrum.