@book { WilliEinmalKaukasusundzurck,
    title = "Willi – Einmal Kaukasus und zurück",
    author = "Marcel {Mallon}",
    year = "2024",
    publisher = "EK-2 Publishing",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/1473077"
}