These are some of the resources used in writing the book My Dear Good Rosi: Letters from Nazi-occupied Holland, 1940-1943.
Jewish Gen — This website provides invaluable online databases and resources for researching Jewish family history.
NIOD (Netherlands Institute for War, Holocaust, and Genocide Studies) — NIOD maintains archives and carries out historical studies on the Second World War.
Rijo — Susanne Rieger and Gerhard Jochem maintain an extensive website dedicated to Jewish life and history in Nuremberg, Furth, and environs. The site provides invaluable Holocaust records and documents.