@book { GtesiegelaufLebensmitteln,
    title = "Gütesiegel auf Lebensmitteln",
    author = "Raffaello {Rossi}",
    year = "2017",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/352809"
}