Year: 1910; Census Place: Manhattan Ward 12, New York, New York; Roll: T624_1023; Page: 11B; Enumeration District: 0583; FHL microfilm: 1375036.
New York State Archives; Albany, New York; State Population Census Schedules, 1925; Election District: 06; Assembly District: 09; City: New York; County: New York; Page: 2.
New York State Archives; Albany, New York; State Population Census Schedules, 1915; Election District: 55; Assembly District: 03; City: New York; County: Queens; Page: 35.
Year: 1920; Census Place: Manhattan Assembly District 9, New York, New York; Roll: T625_1201; Page: 15B; Enumeration District: 667; Image: 202.
"United States Census, 1930," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/X42L-NY6 : accessed 24 Feb 2014), Robert Sour, Manhattan (Districts 0501-0750), New York, New York, United States; citing enumeration district (ED) 0562, sheet , family 229, NARA microfilm publication .