"Michigan, Marriages, 1868-1925," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:N3V6-7BX : accessed 3 June 2015), Peter Krull and Jaii Rooijen Heinsuis, 13 May 1908; citing Grand Rapids, Kent, Michigan, v 3 p 135 rn 2303, Department of Vital Records, Lansing; FHL microfilm 2,342,681.