@book { BernhardHirschveldersBriefrhetorikCgm3607,
    title = "Bernhard Hirschvelders Briefrhetorik (Cgm 3607)",
    author = "Jürgen {Fröhlich}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1094907"
}