Hellpach-Kubatzki Correspondence Collection (页面存档备份,存于互联网档案馆) at the LeoBaeckInstitute, NewYork, NY. 有关威利·赫尔帕奇在德国经济学中央图书馆(ZBW)20世纪新闻档案(英语:20th Century Press
the Concentration Camps Collection (页面存档备份,存于互联网档案馆) at the LeoBaeckInstitute, NewYork, NY. Contains lists of prisoners and correspondence from Sachsenhausen
(页面存档备份,存于互联网档案馆) Franz Werfel Family papers (页面存档备份,存于互联网档案馆) at the LeoBaeckInstitute, NewYork] 阿尔玛·马勒的免费乐谱,由国际乐谱典藏计划提供 开放目录项目中的“Mahler, Alma Schindler”