@book { Schilddrsenproblemenatrlichbehandeln,
    title = "Schilddrüsenprobleme natürlich behandeln",
    author = "",
    year = "2015",
    publisher = "Schlütersche Verlagsgesellschaft mbH & Co. KG",
    address = ", Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403982"
}