https://www.mappingthelives.org/bio/757a6398-0708-462e-a3ca-9f7f6c0cfe6e
https://www.online-begraafplaatsen.nl/zerken.asp?command=showgraf&bgp=721&grafid=337755&view=Zerkenlijst&page=1
Adolf Reis (deceased) - Genealogy (geni.com)
https://www.stenenarchief.nl/hsa_all/hsa_view.php?editid1=2260&
Son: Julius Reis https://www.joodsmonument.nl/en/page/220556/julius-reis