1. "Leo Errthum Death Cert.," Online Database, Dubuque County Courthouse, Dubuque, IA.
2. "Peter Leo Errthum Birth Cert.," Reg. G, pp 112, 166, Dubuque County Courthhouse, Dubuque, IA.
3. "Leo P. Errthum Obituary," The Dyersville Commercial, 6 Dec 2000.
4. "1920 Census," Concord Twp., Dubuque Co., IA, T625_488, 116, 1B.
5. "1930 Census," Holy Cross Town, Concord Twp., Dubuque Co., IA, T626_653, 31-4, 1A.
6. "A Family History of the Albert and Margaret Hefel Family," Ann (Hefel) Hayes, Helen (Hefel) Deutmeyer, Barb (Errthum) Taylor, Phyllis (Deutmeyer) Errthum, typist, 10 Jul 1983.
7. "Frances Errthum Death Cert.," Reg 12, p 237, Dubuque County Courthouse.
8. "Frances Hefel Obituary," The Dyersville Commercial, 22 Oct 1980.
9. "Hefel Errthum Wedding Announcement," The Dyersville Commercial, 1 Jun 1933.
10. "1920 Census," Buena Vista Twp., Clayton Co., IA, T625_484, 61, 4B.
11. "1930 Census," Buena Vista Twp., Clayton Co., IA.
12. "Albert Hefel Death Cert.," Reg. 5, 11, 830, Dubuque Co. Courthouse, Dubuque, IA, Mar 19, 1956.
13. "1900 Census," Buena Vista Twp., Clayton Co., IA, T623_425, 44, 10A.
14. "The Hefel Heritage," Dottisue Gansemer, 1998.
15. "1910 Census," Buena Vista Twp., Clayton Co., IA, T624_397, 53, 11A.
16. "Hefel Rites Held Monday," The Guttenberg Press, 15 Mar 1956.
17. "Hefel Wachendorf Wed. Cert.," Rec. 7, 211, 378, Dubuque Co. Courthouse, Dubuque, IA, Sept 7, 1908.
18. "1920 Census," Julien Twp., Dubque Co., IA, T625_488, 144, 4B.
19. "The Hefel Heritage," Dottisue Gansemer, 1998, Subsource: Death record, St. Martin Church, Dornbirn, Austria.
20. "The Hefel Heritage," Dottisue Gansemer, 1998, Subsource: Baptism Book, St. Martin Church, Dornbirn, Austria.
21. "1900 Census," Buena Vista Twp., Clayton Co., IA, T623_425, 44, 10A-B.
22. "1880 Census," Buena Vista Twp., Clayton Co., IA, T9_333, 127, 2B.
23. "The Hefel Heritage," Dottisue Gansemer, 1998, Subsource: Marr Rec, St. Martin Church, Dornbirn, Austria.
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