Brockhaus, Friedrich Arnold

• Encyclopædia Britannica

The Brockhaus Enzyklopädie (Encyclopedia) is the most famous reference work in German language and was published by the publishing house F.A. Brockhaus until 2009. After more than 200 years, distribution of the Brockhaus Enzyklopädie was discontinued in 2014, since when it has been published exclusively as online-edition.

• Deutsches Wörterbuch

The Duden is a dictionary of the German language, and has long been the prescriptive source of German regarding grammar and spelling. It was first published by Konrad Duden in 1880, with regular updates every four or five years. The current edition published in 2020 is the 28th. The Duden dictionary is also available online.