@book { DasBluthochdruckBuch,
    title = "Das Bluthochdruck-Buch",
    subtitle = "Alles, was Sie wissen müssen. Das können Sie selbst tun",
    author = "Eberhard J. {Wormer}",
    year = "2017",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403101"
}