"Nederland, Indexen van de Archieven, Primaire Archiefstukken (BS en DTB), 1600-2000," database,
FamilySearch (
https://familysearch.org/ark:/61903/1:1:QLN3-JWVJ : 15 November 2019), Gerrit Van Aalsburg, Death 26 Jan 1888, Groningen, Netherlands; from database,
openarchives (https://www.openarch.nl : 2016); citing Bron: boek, Periode: 1888, archive , inventory number , record number 90; Bron: boek, Periode: 1888; AlleGroningers.