Keel, William D. “Deitsch, Dӓӓtsch, Düütsch, and Dietsch: The Varieties of Kansas German Dialects After 150 Years of German Group Settlement in Kansas”.
Yearbook of German-American Studies, vol. 2, Dec. 2006, pp. 27-48,
https://doi.org/10.17161/ygas.v2i.18919.