"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDPF-Z4J : accessed 7 February 2019), Phillip Ricker in household of Charles M Ricker, Jennings, Putnam, Ohio, United States; citing ED 98, sheet 10A, line 10, family 201, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1429; FHL microfilm 1,821,429.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X4CH-R56 : accessed 7 February 2019), Philip J Ricker in household of Charles M Ricker, Jennings, Putnam, Ohio, United States; citing enumeration district (ED) ED 6, sheet 3B, line 69, family 71, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1865; FHL microfilm 2,341,599.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KWLH-W1J : 15 March 2018), Philip Ricker in household of Chas M Ricker, Jennings Township, Putnam, Ohio, United States; citing enumeration district (ED) 69-6, sheet 4B, line 72, family 74, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 3133.