@book { DasHausmitderblauenTr,
    title = "Das Haus mit der blauen Tür",
    subtitle = "Roman",
    author = "Maggie {O'Farrell} and Claus {Varrelmann}",
    year = "2021",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://www.dotbooks.de/document/1149749"
}