↑Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, ed. (2023). "Bahasa Jerman Franka Hulu". Glottolog 4.8. Jena, Jerman: Max Planck Institute for the Science of Human History. ; ;
↑Noble, Cecil A. M. (1983). Modern German dialects New York [u.a.], Lang, p. 119
↑Glück, Helmut (ed.).
Metzler-Lexikon Sprache. Metzler, 1993, p. 442.