1. Das Marienbader Brunnensalz Creator: Ludwig, Ernst Publisher: Perles Type: model:monograph and TEXT Subject: ddc:not used and udc:615.8 ; Language: German Rights: http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
2. Goldene Jugend; Zlaté mládí / That Certain Age Creator: Ludwig, Ernst Publisher: Universal Pictures Format: audiovisual material Type: movie Rights: Creative Commons BY 4.0
3. Maharadžovy perle / Perlen des Maharadschah, Die Creator: Ludwig, Ernst Publisher: Filmvertrieb Carl Otto Schmidt (Berlin) Format: audiovisual material Type: movie Rights: Creative Commons BY 4.0