Weiss 1995. Weiss, Gerhard (1995). "Up-to-Date and with a Past: The "Duden" and its History". Die Unterrichtspraxis / Teaching German. 28 (1): 7–12. doi:10.2307/3531328. JSTOR3531328.
Weiss 1995. Weiss, Gerhard (1995). "Up-to-Date and with a Past: The "Duden" and its History". Die Unterrichtspraxis / Teaching German. 28 (1): 7–12. doi:10.2307/3531328. JSTOR3531328.