"United States Census, 1920," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MDWP-RMW : accessed 24 December 2014), Birtha V Arnold in household of Jacob L Arnold, Northwest Fork, Sussex, Delaware, United States; citing sheet 14B, family 210, NARA microfilm publication T625, National Archives and Records Administration, Washington D.C.; FHL microfilm 1,820,200.
"United States Census, 1930," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XHZJ-Y1Y : accessed 24 December 2014), Bertha V Arnold in household of Jacob L Arnold, Mount Carmel, Northumberland, Pennsylvania, United States; citing enumeration district (ED) 0042, sheet 4A, family 56, line 13, NARA microfilm publication T626, (Washington D.C.: National Archives and Records Administration, 2002), roll 2090; FHL microfilm 2,341,824.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KQND-SZ4 : accessed 29 November 2017), Bertha V Arnold in household of Jacob L Arnold, Mount Carmel Township, Northumberland, Pennsylvania, United States; citing enumeration district (ED) 49-56, sheet 5A, line 18, family 70, 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 3597.
"Find A Grave Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QV29-T8X3 : 13 December 2015), Bertha V Arnold, ; Burial, Stonington, Northumberland, Pennsylvania, United States of America, Northumberland Memorial Park; citing record ID 52193055, Find a Grave, http://www.findagrave.com.
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