"Iowa, Marriages, 1809-1992," index, FamilySearch (https://familysearch.org/ark:/61903/1:1:XJGC-YLK : accessed 5 April 2015), Egbert Vanhulzen and Weitske Vanderwiel, 18 Aug 1871; citing Pella, Marion, Ia, reference 2:3DPQVK4; FHL microfilm 1,019,714.