@book { DifferenzierungspraktikeninderErwachsenenbildung,
    title = "Differenzierungspraktiken in der Erwachsenenbildung",
    author = "Clara {Kuhlen}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b18183",
    url = "https://www.peterlang.com/document/1111905"
}