@book { HauptundNebenwegezuGoethe,
    title = "Haupt- und Nebenwege zu Goethe",
    author = "Volkmar {Hansen}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1099620"
}