"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M832-Z2R : accessed 28 August 2019), Martha E Close in household of Arthur W Close, Lewistown, Fergus, Montana, United States; citing ED 87, sheet 8A, line 4, family 232, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 969; FHL microfilm 1,820,969.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X7WW-5PZ : accessed 28 August 2019), Martha E Close in household of Arthur W Close, Sheridan, Sheridan, Wyoming, United States; citing enumeration district (ED) ED 4, sheet 3B, line 81, family 72, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2624; FHL microfilm 2,342,358.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VTHM-CBK : 26 July 2019), Martha E Hansen in household of Clifford P Hansen, Election District 1, Teton, Wyoming, United States; citing enumeration district (ED) 20-2, sheet 4A, line 20, family 77, 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 4576.