"Netherlands, Archival Indexes, Miscellaneous Records," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QL7G-1ST3 : 22 August 2017), Cornelius Marinus Agnitus Douglas in entry for Henri Frederik Karel Douglas, Birth 12 Dec 1880, 's-Hertogenbosch, Noord-Brabant, Nederland; from database, openarchives (https://www.openarch.nl : 2016); citing 's-Hertogenbosch, archive 50, inventory number 3812, record number 810; ; Brabants Historisch Informatie Centrum.