@book { BluthochdruckganzheitlichsenkenmitderMariaHollMethode,
    title = "Bluthochdruck ganzheitlich senken mit der Maria-Holl-Methode",
    author = "Maria {Holl}",
    year = "2016",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/404001"
}