The Dictionary of German Literature. The 20th Century contains authors writing in German whose main work was created in the 20th century. Volume 13 includes articles on Rudolf Hagelstange, Peter Hacks, Peter Härtling and Willy Haas. In line with the Dictionary's orientation, there are also entries on numerous well-known representatives of their disciplines, e.g. the theologian Romano Guardini, the philosopher and sociologist Jürgen Habermas, the journalist and historian Sebastian Haffner.