Freiheir in Gesellschaft - Metz, Johann Baptist. (OLS)http://ftis/name/52597; Exeler, Adolf. (OLS)http://ftis/name/66457; Kogon, Eugen. (OLS)http://ftis/name/78861; Pesch, Rudolf. (OLS)http://ftis/name/52907 (Herder,, 1971)