| Sources |
- [S286] Huta Komorowska Births, 1890-1926 (Majdan Królewski), year 1904, act 42; Jan Kopeć birth and baptism.
- [S9318] 1930 United States Federal Census, Year: 1930; Census Place: Passaic, Passaic, New Jersey; Page: 4A; Enumeration District: 0129; FHL microfilm: 2341112.
- [S9100] U.S., Social Security Death Index, 1935-2014, Social Security Administration; Washington D.C., USA; Social Security Death Index, Master File.
- [S9285] U.S., World War II Draft Cards Young Men, 1940-1947, The National Archives in St. Louis, Missouri; St. Louis, Missouri; WWII Draft Registration Cards for New Jersey, 10/16/1940-03/31/1947; Record Group: Records of the Selective Service System, 147; Box: 356.
- [S9125] New Jersey, U.S., Death Index, 1848-1878, 1901-2017, Year Range: 1985; Surname Range: G-K; Title: New Jersey, Death Indexes, 1904-2000.
- [S9282] 1940 United States Federal Census, Year: 1940; Census Place: Passaic, Passaic, New Jersey; Roll: m-t0627-02377; Page: 10B; Enumeration District: 16-75.
- [S9308] U.S., City Directories, 1822-1995.
- [S9114] 1950 United States Federal Census, United States of America, Bureau of the Census; Washington, D.C.; Seventeenth Census of the United States, 1950; Record Group: Records of the Bureau of the Census, 1790-2007; Record Group Number: 29; Residence Date: 1950; Home in 1950: Newark, Passaic, New Jersey; Roll: 2384; Sheet Number: 72/42; Enumeration District: 31-5.
- [S9100] U.S., Social Security Death Index, 1935-2014, Number: 143-05-4768; Issue State: New Jersey; Issue Date: Before 1951.
- [S195] Newspapers.com Obituary Index, 1800s-current, The Record; Publication Date: 31/ Mar/ 1985; Publication Place: Hackensack, New Jersey, United States of America; URL: https://www.newspapers.com/image/494723677/?article=f24dd288-baa1-432d-a3ba-86d4358c7197&focus=0.20420292,0.76797837,0.3566463,0.8321613.
The Record; Publication Date: 31/ Mar/ 1985; Publication Place: Hackensack, New Jersey, United States of America; URL: https://www.newspapers.com/image/494723677/?article=f24dd288-baa1-432d-a3ba-86d4358c7197&focus=0.20420292,0.76797837,0.3566463,0.8321613
- [S247] Huta Komorowska Marriages, 1856-1915 (Majdan Królewski), year 1902, act 2; Łukasz Kopeć and Ewa Krząstek marriage.
- [S9284] New Jersey, U.S., Marriage Index, 1901-2016, New Jersey State Archives; Trenton, New Jersey; Marriage Indexes; Index Type: Bride; Year Range: 1937; Surname Range: A - Z; Reel Number: 35.
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