@book { Diabetesnatrlichbehandeln,
    title = "Diabetes natürlich behandeln",
    subtitle = "Wirksame Wege, Ihren Blutzucker natürlich zu senken",
    author = "Sven-David {Müller}",
    year = "2010",
    publisher = "Schlütersche Verlagsgesellschaft mbH & Co. KG",
    address = ", Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403548"
}