Jelaskan Volume dari Duden

– The Dictionary of Style

– The Dictionary of Foreign Words

– Correct and Good German (Guide to usage)

Betz, Werner.  [Modified language of the world: semantics, politics and manipulation]. Edition Interfrom AG: Zürich, 1977.

Hellmann, Manfred W. (ed.)  [On public usage in the Federal Republic of Germany and in the GDR]. Düsseldorf: Pädagogischer Verlag Schwann, 1973.

Reich, Hans H.  [Language and politics: studies on vocabulary and terminology of the official use of language in the GDR]. Munich: Max Hueber Verlag, 1968.

Schlosser, Horst Dieter (ed).  [Communications requirements and everyday language in the former GDR]. Hamburg: Helmut Buske Verlag, 1991.

Siegl, Elke Annalene.  [Duden East, Duden West: On language in Germany since 1945: a comparison of Leipzig and Mannheim editions of Duden since 1947]. Düsseldorf: Schwann, 1989.