Willem Bos en tant qu·Äôentrâ©e de Martina Maria Bos, "Pays-Bas, Index d·Äôarchives, Registres d·Äôâ©tat civil, 1600-2000"
"Nederland, Indexen van de Archieven, Primaire Archiefstukken (BS en DTB), 1600-2000," database,
FamilySearch (
https://familysearch.org/ark:/61903/1:1:QL9X-CQB3 : 22 August 2017), Willem Bos in entry for Martina Maria Bos, Birth 14 Mar 1825, Vrijenban, South Holland, Netherlands; from database,
openarchives (https://www.openarch.nl : 2016); citing Vrijenban, archive 0158, inventory number 01620, Register van geboorteakten, 1825, record number 10, folio; Archief van de gemeente Vrijenban [open data, versie 20160128]; Archief Delft.