@book { DasGeheimnisderweienSoldaten,
    title = "Das Geheimnis der weißen Soldaten",
    author = "Werner {Gerl}",
    year = "2024",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1485066"
}