@book { ArbeitszeitundArbeitszeiterfassung,
    title = "Arbeitszeit und Arbeitszeiterfassung",
    author = "Lena {Pingen}",
    year = "2020",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b17785",
    url = "https://www.peterlang.com/document/976899"
}