Dramatic Compositions copyrighted in the United States 1870 to 1916, Library of Congress. Copyright Office, Bände 1 und 2, Washington 1918 Internet Archive Bd. 1; Internet Archive Bd.2
Als Beispiel die Anzeige zu seinem U-Boot-Film in Lichtbild-Bühne, 10. Jahrgang, April 1917, Nummer 16, S. 68–70. (Internet Archive)
uchicago.edu
storage.lib.uchicago.edu
Judaica. A Short-Title Catalogue of the Books, Pamphlets and Manuscripts relating to the political, social and cultural History of the Jews and the Jewish Question. In the Library of Ludwig Rosenberger, Cincinnati 1979, S. 16 online-pdf
