[B160] Overlijden Frank T. Werthman, in: New York State, Department of Health (Albany, New York, USA), Death Index 1919, pagina 1166, Certificate nr. 24917; FamilySearch (Salt Lake City, Utah, USA), "New York, State Death Index, 1880-1956", online database (met online afbeeldingen van Reclaim The Records, Mill Valley, California, USA),
https://www.familysearch.org/ark:/61903/1:1:QGP6-XRVW (geraadpleegd 26-12-2021).