"United States Census, 1860," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MWDZ-K7G : accessed 15 Aug 2014), Roelff Dozenma in household of Hendrick Dozenma, The Town Of Zeeland, Ottawa, Michigan, United States; citing "1860 U.S. Federal Census - Population," Fold3.com; p. 52, household ID 401, NARA microfilm publication M653; FHL microfilm 803557.