Low, Alfred D. (1974). The Anschluss movement, 1918-1919, and the Paris Peace Conference. American Philosophical Society. с. 350 et seq. ISBN978-0-87169-103-3. «As far as Switzerland was concerned, she only considered Vorarlberg's Anschluss with herself, because the alternative, an Anschluss with Germany, seemed to constitute a clear threat to her.»
Josef Inauen, Brennpunkt Schweiz: die süddeutschen Staaten Baden, Württemberg und Bayern und die Eidgenossenschaft 1815—1840, Saint-Paul (2008), p. 208.