@book { Mordam18Loch,
    title = "Mord am 18. Loch",
    author = "John-Erich {Nielsen} and Astrid {Büntge} and Astrid {Büntge}",
    year = "2021",
    publisher = "unisono.fr",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/1158471"
}