@book { SubunternehmerundInternationalesPrivatrecht,
    title = "Subunternehmer und Internationales Privatrecht",
    author = "Florian {Pulkowski}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1098138"
}