Found in articles
papers at the Smithsonian Archives of American Art Lyonel Feininger Archives at Busch-Reisinger Museum Archives, Harvard Art Museum Biography Feininger-Galerie
（页面存档备份，存于互联网档案馆） Charles Scribner's Sons Art Reference Department records at the Smithsonian Archives of American Art （页面存档备份，存于互联网档案馆） Charles Scribner's
Archives of American Art. 2011 [17 Jun 2011]. （原始内容存档于2016-09-03）. American Academy in Rome （页面存档备份，存于互联网档案馆） Smithsonian Archives of American Art —
（页面存档备份，存于互联网档案馆）, Archives of American Art, Smithsonian Institution The New Spirit: American Art in the Armory Show, 1913 at the Montclair Art Museum, February
（原始内容存档于2015-04-02）. Bradsher, Greg. Documenting Nazi Plunder of European Art. The National Archives of the United States. November 1997 [2022-07-26]. （原始内容存档于2011-09-19）