@book { BleibendeLebensinhalte,
    title = "Bleibende Lebensinhalte",
    subtitle = "Essays zu Adalbert Stifter und Gottfried Keller",
    author = "Gunter H. {Hertling}",
    year = "2003",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1096747"
}