@book { DiekonzerninterneArbeitnehmerberlassung,
    title = "Die konzerninterne Arbeitnehmerüberlassung",
    author = "Stephan {Worpenberg}",
    year = "1993",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1081048"
}