"Michigan, Marriages, 1868-1925," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:N3XL-CXN : accessed 10 July 2015), John Duiven and Grietje De Vries Bekuis, 05 May 1898; citing Grand Rapids, Kent, Michigan, v 2 p 456 rn 12196, Department of Vital Records, Lansing; FHL microfilm 2,342,509.