"Michigan, Marriages, 1868-1925," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/N3NM-83T : accessed 9 January 2015), Henry J. Cass and Tryntye Wierema, 23 May 1878; citing Vriesland, Ottawa, Michigan, v 3 p 70 rn 58, Department of Vital Records, Lansing; FHL microfilm 2,342,463.
"Michigan, Marriages, 1822-1995," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/FC81-PVH : accessed 9 January 2015), Henry J. Cass and Tryntje Wiersma, 23 May 1878; citing reference p. 162/68; FHL microfilm 984,231.