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- [S1790] Social Security Administration, Social Security Applications and Claims Index, 1936-2007, (Ancestry.com (http://www.ancestry.com : 2015)), entry for Billy Marshall Walkup, 1993, SS no. 260-76-1029, accessed 14 Dec 2018 (Reliability: 3).
- [S1842] Florida Department of Health, Office of Vital Records, Florida Death Index, 1877-1998, ((http://www.ancestry.com : 2004)), accessed 14 Dec 2018), Billy Walkup, 1993, Hillsborough County. (Reliability: 3).
- [S1241] Find A Grave, Find A Grave, ((http://www.findagrave.com/)), accessed 14 Dec 2018), Billy Walkup (Memorial #54218855); added by Donna McPherson (Member #46906329). (Reliability: 3).
- [S1546] West Virginia. Monroe County., Monroe Co., WV Marriage Register, (Digital images. West Virginia Division of Culture and History, West Virginia Vital Research Records. http://www.wvculture.org/vrr/ : 2010.), marriage register p. 160, Walkup-Mills, 1934; accessed 13 Dec 2018. (Reliability: 3).
- [S1924] Florida Department of Health, Florida Marriage Indexes, 1822-1875 and 1927-2001, ((http://www.ancestry.com : 2006)), accessed 14 Dec 2018), Walkup-Reublin, 1989, Polk County. (Reliability: 3).
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