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- [S4840] https://www.findagrave.com, Headstone, Duff, Ella Evans and Charles Dryden Duff, (https://www.findagrave.com/memorial/24054469/ella-duff) (Reliability: 2).
- [S674] Ancestry.com, 1930 United States Federal Census, Clay City, Illinois, (District 0003) (Village), image 04, page 2b, (https://www.ancestry.com/interactive/6224/4584337_00604?backurl=https%3a%2f%2fsearch.ancestry.com%2fsearch%2fdb.aspx%3fd), none. (Reliability: 2).
- [S485] Ancestry.com, 1920 United States Federal Census, Clay City, Clay County, Illinois, Enumeration District 3, Page 12B, (http://search.ancestry.com/content/viewer.aspx?dbid=6061&iid=4300174_00630&sid=&gskw=) (Reliability: 2).
- [S4841] http://www.findagrave.com, Biography, Duff, C. D., (http://findagrave.com/cgi-bin/fg.cgi?page=gr&GSsr=641&GScid=105163&GRid=24054461&) (Reliability: 2).
- [S42] Ancestry.com, 1920 United States Federal Census, Clay City, Clay County, Illinois, Enumeration District 3, Page 10A, (http://search.ancestry.com/content/viewer.aspx?dbid=6061&iid=4300174_00626&sid=&gskw=) (Reliability: 2).
- [S674] Ancestry.com, 1930 United States Federal Census, Clay City, Illinois, (District 0003) (Village), image 04, page 2b, (https://www.ancestry.com/interactive/6224/4584337_00604?backurl=https%3a%2f%2fsearch.ancestry.com%2fsearch%2fdb.aspx%3fd), none.
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