@book { HeinrichBllundGnterGrassindenUSA,
    title = "Heinrich Böll und Günter Grass in den USA",
    author = "Walter {Ziltener}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1071153"
}