"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MMBT-NY8 : accessed 2 October 2021), Arthur Parker in household of Amon B Parker, Union Township (east half) Eaton town, Delaware, Indiana, United States; citing enumeration district (ED) 53, sheet 21B, family 480, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,368.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MKG6-QKH : accessed 2 October 2021), Arther D Parker in household of Amos B Parker, Hamilton, Delaware, Indiana, United States; citing enumeration district (ED) ED 43, sheet 3A, family 56, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 346; FHL microfilm 1,374,359.