"United States Census, 1860," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MWDD-9R4 : accessed 20 March 2015), Genn Mokma in household of Sakom Dogger, Township Of Olive, Ottawa, Michigan, United States; from "1860 U.S. Federal Census - Population," Fold3.com; citing p. 203, household ID 1556, NARA microfilm publication M653, National Archives and Records Administration, Washington, D.C.; FHL microfilm 803,557.