Yad Vashem the Holocaust memorial, archives and museum, Jerusalem. The "Avenue of the Just" includes the tree Betty and her family planted for Victor and Josephine Guicherd. 

Klars and Beate Klarsfeld, the Nazi hunters


ADL, Anti-Defamation, Hidden Children Foundation
mail: Hidden Child Foundation
823 United Nations Plaza
New York, NY 10017

.Generation to Generation: Bearers of the Holocaust and Heroism Legacy

E-Mail: dorot

Aloumim, Association of French Hidden Children in Israel

YIVO, Institute for Jewish Research Archives .

Chronology  of Jewish Persecution

Shoah Institute Foundations (set up by Steven Spielberg, includes a long interview with Betty)