@book { MontessoriGeragogik,
    title = "Montessori-Geragogik",
    subtitle = "Der alternde Mensch im Mittelpunkt",
    author = "Christine {Mitterlechner}",
    year = "2022",
    publisher = "facultas",
    address = "Wien, Österreich",
    url = "https://campus-lizenzen.facultas.at/document/1264186"
}