↑ "Texas, County Marriage Index, 1837-1977," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F61F-VJZ : 22 December 2016), Bennie Gerstmann and Effie Maxey, 22 Oct 1911; citing Travis, Texas, United States, county courthouses, Texas; FHL microfilm 978,171.
"United States World War I Draft Registration Cards, 1917-1918," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KZ6B-KDJ : 12 December 2014), Benjamin William Gerstmann, 1917-1918; citing Blanco County, Texas, United States, NARA microfilm publication M1509 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,927,366.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K43B-YTS : accessed 27 October 2017), Bennie Gerstman, Tract 10, Austin, Justice Precinct 3, Travis, Texas, United States; citing enumeration district (ED) 227-49, sheet 20A, line 32, family 410, 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 4150.