Linguistic critic Bastian Sick.
Any book or other printed publication.
The German privacy and civil rights organisation Digitalcourage e.V.
The German radio station Deutschlandfunk
The German standard dictionary Duden
The German online dictionary DWDS (Digitales Wörterbuch der deutschen Sprache).
The German “Portal for Orthography” korrekturen.de.
The federated social media network Mastodon. Only posts from qualified users shall be used as sources.
The German dictionary and publishing house PONS.
The German news magazine Der Spiegel. Mainly to be used for the column Zwiebelfisch by Bastian Sick.
Wikipedia, the free encyclopedia.
Wiktionary, the free dictionary.
The multilingual online dictionary Woxikon.
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Indicates the source of a Mistake rule. Saved in Fields#source.