↑ "Michigan Obituaries, 1820-2006," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QL33-JHPH : 1 April 2020), Daniel Sydlik in entry for Sophie Gucwa, 19 Nov 1970; citing , Obituary, Grand Rapids Public Library, Michigan; FHL microfilm 1,358,319.
↑ "United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VM7G-CZ9 : 11 January 2021), Daniel Sydlik, 18 Apr 2006; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X7MX-MPQ : accessed 5 September 2021), Daniel Sydlik in household of John Jucwa, Wells, Tuscola, Michigan, United States; citing enumeration district (ED) ED 38, sheet 5B, line 78, family 96, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1027; FHL microfilm 2,340,762.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:K9HN-9YB : 6 January 2021), Daniel D Sidlik in household of Clara Brown, Long Beach Judicial Township, Los Angeles, California, United States; citing enumeration district (ED) 59-108, sheet 10A, line 12, family 242, 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 372.
"Michigan Obituaries, 1820-2006," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QL3S-BCWL : 1 April 2020), Dan Sydlik in entry for John W Gucwa, 07 Feb 1973; citing , Obituary, Grand Rapids Public Library, Michigan; FHL microfilm 1,358,319.
"United States Public Records, 1970-2009," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:KJ1V-BBY : 22 May 2014), Daniel Sydlik, Residence, Honolulu, Hawaii, United States; a third party aggregator of publicly available information.