"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XH62-G2Y : accessed 6 October 2018), Retta M Robinson in household of Raymond G Robinson, Lehi, Utah, Utah, United States; citing enumeration district (ED) ED 21, sheet 6A, line 13, family 130, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2423; FHL microfilm 2,342,157.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VT4C-9D9 : 14 March 2018), Retta May Robinson in household of Erma Robinson, Lehi, Lehi Election Precinct, Utah, Utah, United States; citing enumeration district (ED) 25-23, sheet 7B, line 80, family 141, 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 4219.