Gerhard Weiss (1995). "Up-to-Date and with a Past: The "Duden" and Its History". Die Unterrichtspraxis / Teaching German. Wiley. 6 (1: The Publisher as Teacher): 7–21. doi:10.2307/3531328. JSTOR3531328.
jstor.org
Gerhard Weiss (1995). "Up-to-Date and with a Past: The "Duden" and Its History". Die Unterrichtspraxis / Teaching German. Wiley. 6 (1: The Publisher as Teacher): 7–21. doi:10.2307/3531328. JSTOR3531328.