@book { DerPrinzderdreiHeere,
    title = "Der Prinz der drei Heere",
    author = "Jona {Dreyer}",
    year = "2022",
    publisher = "Tschök & Tschök GbR",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/1308011"
}