| Sources |
- [S1906] Missouri Death Certificates, (Mary C. Heyenbrock, 27 MAY 2007), 27 May 2007 (Reliability: 2).
- [S1907] population schedule, Davis Township, (Lafayette County, Missouri, United States: Mary Heyenbrock household, 1910), 27 May 2007, micropublication T624, roll 794. (Reliability: 2).
- [S1908] population schedule, Davis Township, (Lafayette County, Missouri, United States: Mary Heyenbrock household, 1900), 27 May 2007, micropublication T623, roll 869. (Reliability: 2).
- [S1910] population schedule, Davis Township, (Lafayette County, Missouri, United States: Mary Heyenbrock household, 1880), 27 May 2007, micropublication T9, roll 698. (Reliability: 2).
- [S1911] population schedule, Davis Township, Concordia postoffice, (Lafayette County, Missouri, United States: William Heyenbrock household, 1870), 27 May 2007, micropublication M593, roll 786. (Reliability: 2).
- [S2015] Heyenbrock Family Bible, (New York, New York, United States: Amerisantischen Bibel-Gesellschaft, 1884), 02 Dec 2007 (Reliability: 3).
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