https://www.oorlogsbronnen.nl/tijdlijn/Alfred-Sander/01/76398
https://www.joodsmonument.nl/en/page/208263/alfred-sander
https://www.mappingthelives.org/bio/53b33a0d-d135-4449-bda8-792a7bb01113
https://museenkoeln.de/ns-dokumentationszentrum/default.aspx?sfrom=2926&s=2922&id=12675&buchstabe=&ort=Mauthausen
https://archief.amsterdam/indexen/deeds/98533402-8525-56a3-e053-b784100ade19?person=98533402-8526-56a3-e053-b784100ade19