@book { DasCholesterinBuch,
    title = "Das Cholesterin-Buch",
    subtitle = "So senke ich meine Blutfettwerte. Neueste Therapien - gesicherte Maßnahmen",
    author = "Dr. Ramon {Martinez}",
    year = "2023",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/500431"
}