@book { ZeitgenossenGemmasVerwandlungBd1,
    title = "Zeitgenossen - Gemmas Verwandlung (Bd. 1)",
    author = "Hope {Cavendish}",
    year = "2020",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/995941"
}