@book { Cholesterinselbstsenkenin10Wochen,
    title = "Cholesterin selbst senken in 10 Wochen",
    author = "Dr. med. Ramon {Martinez}",
    year = "2018",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/404153"
}