"Michigan, Marriages, 1868-1925," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:N361-Y86 : accessed 23 May 2015), Henry Bergman and Gertie Peterson, 11 Jun 1891; citing Grand Rapids, Kent, Michigan, item 2 p 431 rn 4128, Department of Vital Records, Lansing; FHL microfilm 2,342,491.