@book { AbnehmenmitTorte,
    title = "Abnehmen mit Torte",
    subtitle = "Abenteuer eines Selfmadeadeligen",
    author = "Lo {Graf von Blickensdorf}",
    year = "2016",
    publisher = "hey! publishing",
    address = "München, Germany",
    url = "https://www.heypublishing.com/document/335931"
}