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- [S9046] Ancestry.com, USA, Find A Grave-Index, 1600-heute, (Name: Ancestry.com Operations, Inc.; Location: Lehi, UT, USA; Date: 2012;).
https://www.findagrave.com/memorial/266129098/irene-lilly-pyka
- [S12644] Ancestry.com, Texas, U.S., Birth Certificates, 1903-1932, (Name: Ancestry.com Operations, Inc.; Location: Lehi, UT, USA; Date: 2013;), Texas Department of State Health Services; Austin, TX; Texas, U.S., Birth Certificates, 1903-1932.
Record for Alfred Charles Englehardt
https://search.ancestry.com/cgi-bin/sse.dll?db=2275&h=108017332&indiv=try
- [S10281] Ancestry.com, Texas, USA, Geburtenindex, 1903–1997, (Name: Ancestry.com Operations Inc; Location: Lehi, UT, USA; Date: 2005;).
Record for Irene Lilly Englehardt
https://search.ancestry.com/cgi-bin/sse.dll?db=8781&h=2137501&indiv=try
- [S12515] Ancestry Family Tree, (Location: Online publication - Provo, UT, USA: Ancestry.com. Original data: Family Tree files submitted by Ancestry members.;).
Record for Alfred Charlie Engelhardt
https://search.ancestry.com/cgi-bin/sse.dll?db=1030&h=19209187630&indiv=try
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