@book { DieFeuerspatzenAbenteueraufMallorca,
    title = "Die Feuerspatzen, Abenteuer auf Mallorca",
    author = "Oliver {Groß}",
    year = "2022",
    publisher = "Oliver Groß",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/1263468"
}