@book { WirtreffenunsaufWolke7,
    title = "Wir treffen uns auf Wolke 7",
    author = "Gemma {Townley} and Barbara {Ritterbach}",
    year = "2023",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://m.dotbooks.de/document/1190018"
}