@book { NeueHuserderErwachsenenbildung1959und2019,
    title = "Neue Häuser der Erwachsenenbildung 1959 und 2019",
    author = "Bernd {Käpplinger}",
    year = "2020",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b16421",
    url = "https://www.peterlang.com/document/1111392"
}