"United States World War I Draft Registration Cards, 1917-1918", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K6J9-JTK : 23 February 2021), George Sotirion, 1917-1918.
"New York, New York City Marriage Records, 1829-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:247D-SBD : 10 February 2018), George Sotirion and Stella Mayers, 03 Sep 1919; citing Marriage, Manhattan, New York, New York, United States, New York City Municipal Archives, New York; FHL microfilm 1,643,412.
"New York, County Naturalization Records, 1791-1980," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QP8Z-MC3L : 2 March 2021), George Sotirion, 1920; citing Naturalization, New York, United States, citing multiple County Clerk offices of New York; FHL microfilm 005411759.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X4J5-BN5 : accessed 6 June 2021), George Soterion, Brooklyn (Districts 1251-1500), Kings, New York, United States; citing enumeration district (ED) ED 1410, sheet 10A, line 1, family 187, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1524; FHL microfilm 2,341,259.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KQ9L-H18 : 19 November 2019), George Soteriou, Assembly District 16, Brooklyn, New York City, Kings, New York, United States; citing enumeration district (ED) 24-1780, sheet 1A, line 10, family 3, 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 2592.