"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MNS8-FY5 : accessed 25 August 2015), Newton Littlejohn, Wisconsin, United States; citing p. 44, family 339, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 553,240.
"Wisconsin, State Census, 1875," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MM9Q-L4S : accessed 25 August 2015), Newton Littlejohn, Whitewater, Walworth, Wisconsin; State Historical Society, Madison; FHL microfilm 1,032,694.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MM2K-F3R : accessed 25 August 2015), Newton M Littlejohn, Whitewater city Ward 2, Walworth, Wisconsin, United States; citing sheet 8B, family 214, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,241,821.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MP25-ZY8 : accessed 25 August 2015), Newton M Littlejohn, Whitewater Ward 2, Walworth, Wisconsin, United States; citing enumeration district (ED) 155, sheet 2A, family 41, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,375,753.