@book { AGBKontrollevonArbeitsvertrgen,
    title = "AGB-Kontrolle von Arbeitsverträgen",
    author = "Jens {Günther}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1103803"
}