@book { DasVersprechendesHighlanders,
    title = "Das Versprechen des Highlanders",
    author = "May {McGoldrick} and Nicole {Hölsken}",
    year = "2017",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://m.dotbooks.de/document/356221"
}