As quoted in: Lazaroms, Ilse Josepha (2014-10-08), "Roth, Joseph", 1914–1918-online/International Encyclopedia of the First World War. Issued by Freie Universität Berlin. doi:10.15463/ie1418.10244. The quotation is from a letter to Otto Forst-Battaglia, dated 28 October 1932.
Liukkonen, Petri. "Joseph Roth". Books and Writers (kirjasto.sci.fi). Finland: Kuusankoski Public Library. Archived from the original on 23 September 2010.
Liukkonen, Petri. "Joseph Roth". Books and Writers (kirjasto.sci.fi). Finland: Kuusankoski Public Library. Archived from the original on 23 September 2010.