1. Circulaire Rectorale Langue et Culture Regionales: Voie Specifique Mosellane,1990
2. Sprachstatistik in Deutschland
3. Language or dialect, that is the question. Special Issue on “Language Attitudes, Vitality and Development”;Adler;Languages,2021
4. Languages and language policies in Germany/Sprachen und Sprachenpolitik in Deutschland;Adler,2018
5. The Current Status and Use of Low German. Initial Results of a Representative Study;Adler,2018