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- [S233] Rozalin Births, 1843-1898 (Majdan Królewski), year 1888, act 6; Felicjana Cudo birth and baptism.
- [S16] New York, U.S., Passenger and Crew Lists (including Castle Garden and Ellis Island), 1820-1957, Year: 1904; Arrival: New York, New York, USA; Microfilm Serial: T715, 1897-1957; Line: 9; Page Number: 48.
- [S9389] 1910 United States Federal Census, Year: 1910; Census Place: Lynn Ward 6, Essex, Massachusetts; Roll: T624_585; Page: 11b; Enumeration District: 0411; FHL microfilm: 1374598.
- [S9322] 1920 United States Federal Census, Year: 1920; Census Place: Saugus, Essex, Massachusetts; Roll: T625_697; Page: 6B; Enumeration District: 284.
- [S9318] 1930 United States Federal Census, Year: 1930; Census Place: Saugus, Essex, Massachusetts; Page: 7B; Enumeration District: 0276; FHL microfilm: 2340638.
- [S9100] U.S., Social Security Death Index, 1935-2014, Social Security Administration; Washington D.C., USA; Social Security Death Index, Master File.
- [S6177] Massachusetts, U.S., Death Index, 1901-1980.
- [S5324] Massachusetts, U.S., Marriage Records, 1840-1915, New England Historic Genealogical Society; Boston, Massachusetts; Massachusetts Vital Records, 1911–1915.
- [S6187] Massachusetts, U.S., Marriage Index, 1901-1955 and 1966-1970.
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