- [S20] Matthew Ryan, June 23, 1900 Census Record, Provo, Utah, Church of the Latter Day Saints.
- [S111] The Henry News Republican (Henry Illinois: The Henry News Republican. Hereinafter cited as The Henry News Republican.
- [S246] [Unknown author], Obituary Jeremiah Day (Jefferson, Iowa: The Jefferson Bee, April 20, 1932). Hereinafter cited as Obituary Jeremiah Day.
- [S254] Jeremiah Day, April 4, 1930 Census Record, Provo, Utah, Church of the Latter Day Saints.
- [S317] Johanna Day Ryan, April 22, 1910 Census Record, Provo, Utah, Church of the Latter Day Saints.
- [S318] Johanna Day Ryan, January 2, 1920 Census Record, Provo, Utah, Church of the Latter Day Saints.
- [S319] Johanna Day Ryan, April 8, 1930 Census Record, Provo, Utah, Church of the Latter Day Saints.
- [S324] David Hickey, June 6, 1870 Census Record, Provo, Utah, Church of the Latter Day Saints.
- [S347] John Day, April 24, 1910 Census Record, Provo, Utah, Church of the Latter Day Saints.
- [S351] John Day, January 9, 1920 Census Record, Provo, Utah, Church of the Latter Day Saints.
- [S352] Andrew O'Neil, June 20, 1900 Census Record, Provo, Utah, Church of the Latter Day Saints.
- [S353] Andrew O'Neil, April 22, 1910 Census Record, Provo, Utah, Church of the Latter Day Saints.
- [S354] Andrew O'Neil, January 17, 1910 Census Record, Provo, Utah, Church of the Latter Day Saints.
- [S355] Andrew O'Neil, April 23, 1930 Census Record, Provo, Utah, Church of the Latter Day Saints.
- [S514] Anonymous, Obituary Andrew Harold O'Neill (Wyoming, Illinois: Wyoming Post Herald, Janujary 14, 1948). Hereinafter cited as Obituary Andrew Harold O'Neill.
- [S545] Montana, State Deaths, 1907-2016, online <https://www.ancestry.com>. Hereinafter cited as Montana, State Deaths, 1907-2016.
- [S548] William Day, January 21, 1920 Census Record, Provo, Utah, Church of the Latter Day Saints.
- [S550] William Day, 1940 Census Record, Provo, Utah, Church of the Latter Day Saints.
- [S566] Charles Green, April 20, 1910 Census Record, Provo, Utah, Church of the Latter Day Saints.
- [S571] James Day, April 30, 1940 Census Record, Provo, Utah, Church of the Latter Day Saints.
- [S572] Mary Day, April 3, 1940 Census Record, Provo, Utah, Church of the Latter Day Saints.
- [S575] Illinois, Marriage Index, 1860-1920, online <https://www.ancestry.com>. Hereinafter cited as Illinois, Marriage Index, 1860-1920.
- [S593] Social Security Death Index: John Day, by Social Security Administration; Social Security Death Index.; Catherine Mary Flinn, Washington D.C. Online http://www.ssa.gov/; Master File.
- [S596] Interview with John Day (307 East Garfield Sttreet, Jefferson, Iowa), by Dennis and Trisha Day, 1976. Unknown repository (unknown repository address).
- [S608] California, U.S. Marriage Index, 1949-1959, online <https://www.ancestry.com/>. Hereinafter cited as California, U.S. Marriage Index, 1949-1959.