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- [S241] Majdan Births, 1865-1891 (Majdan Królewski), year 1884, act 11; Franciszka Kopeć birth and baptism.
- [S9427] New York, New York, U.S., Index to Birth Certificates, 1866-1909, New York City Department of Records & Information Services; New York City, New York; New York City Birth Certificates.
- [S9714] New York, New York, U.S., Death Index, 1949-1965.
- [S502] New York, U.S., State Census, 1905, New York State Archives; Albany, New York; State Population Census Schedules, 1905; Election District: A.D. 14 E.D. 16; City: Brooklyn; County: Kings; Page: 12.
- [S9389] 1910 United States Federal Census, Year: 1910; Census Place: Brooklyn Ward 14, Kings, New York; Roll: T624_962; Page: 16A; Enumeration District: 0287; FHL microfilm: 1374975.
- [S9282] 1940 United States Federal Census, Year: 1940; Census Place: New York, Kings, New York; Roll: m-t0627-02585; Page: 1B; Enumeration District: 24-1504.
- [S9318] 1930 United States Federal Census, Year: 1930; Census Place: Brooklyn, Kings, New York; Page: 1A; Enumeration District: 0224; FHL microfilm: 2341254.
- [S9416] New York, U.S., State Census, 1925, New York State Archives; Albany, New York; State Population Census Schedules, 1925; Election District: 14; Assembly District: 14; City: Brooklyn; County: Kings; Page: 57.
- [S16] New York, U.S., Passenger and Crew Lists (including Castle Garden and Ellis Island), 1820-1957, The National Archives and Records Administration; Washington, D.C.; Passenger and Crew Lists of Vessels Arriving at and Departing from Ogdensburg, New York, 5/27/1948 - 11/28/1972; Microfilm Serial or NAID: T715, 1897-1957.
- [S9114] 1950 United States Federal Census, National Archives at Washington, DC; Washington, D.C.; Seventeenth Census of the United States, 1950; Year: 1950; Census Place: New York, Kings, New York; Roll: 214; Page: 76; Enumeration District: 24-2217.
- [S9072] U.S., Find a Grave® Index, 1600s-Current.
- [S239] Majdan Marriages, 1854-1901 (Majdan Królewski), year 1874, act 15; Franciszek Kopeć and Magdalena Jarosz marriage.
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