"Netherlands, Archival Indexes, Vital Records," database, FamilySearch (
https://familysearch.org/ark:/61903/1:1:QL5N-2RVN : 6 October 2017), Johannes Baarda in entry for Derk Baarda and Gezina Buining, Marriage 17 Jul 1895, Ulrum, Groningen,Nederland; from database, openarchives (https://www.openarch.nl : 2016); citing Ulrum, archive , inventory number , record number 24; ; AlleGroningers.