@book { DasZusammenwachsenvonHandwerkskammerninDeutschland,
    title = "Das Zusammenwachsen von Handwerkskammern in Deutschland ",
    author = "Hans-Karl {Bauer}",
    year = "2020",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b17195",
    url = "https://www.peterlang.com/document/1058953"
}