- Author: Sitta von Reden, Kai Ruffing (editors)
- Language: German
- Year: 2023
- Author: Sitta von Reden, Kai Ruffing (editors)
- Language: German
- Year: 2023
Wirtschaften in den Bergen: Von Bergleuten, Hirten, Bauern, Künstlern, Händlern und Unternehmern
pdf
- Author: Michael Kasper, Robert Rollinger, Andreas Rudigier, Kai Ruffing
- Language: German
- Year: 2020
- Author: Kerstin Droß-Krüpe Kai Ruffing (eds.)
- Language: German
- Year: 2022
- Author: Hans-Joachim Drexhage, Heinrich Konen, Kai Ruffing
- Language: German
- Year: 2002
- Author: Ulrich Niggemann (editor), Kai Ruffing (editor)
- Language: German
- Year: 2011
