"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:V1LV-KSX : accessed 27 July 2018), Leonard L Yates in household of Arthur H Yates, Cragford, Election Precinct 4, Clay, Alabama, United States; citing enumeration district (ED) 14-4, sheet 7B, line 51, family 129, 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 15.
Find A Grave, database and images (https://www.findagrave.com : accessed 27 July 2018), memorial page for Leonard Lloyd Yates (29 May 1933–1 Sep 2011), Find A Grave Memorial no. 145455281, citing Jefferson Memorial Gardens East, Trussville, Jefferson County, Alabama, USA ; Maintained by TLV (contributor 48614117) .