@book { Bluthochdruckselbstsenken,
    title = "Bluthochdruck selbst senken",
    subtitle = "Das erfolgreiche 8-Schritte-Programm. Alles, was Sie wissen müssen",
    author = "Dr. Ramon {Martinez}",
    year = "2023",
    publisher = "Schlütersche Verlagsgesellschaft mbH & Co. KG",
    address = ", Deutschland",
    url = "https://schluetersche.openpublishing.com/document/1390760"
}