@book { PromoPrintMagazin22021,
    title = "Promo Print Magazin 2 / 2021",
    author = "Marc {Debus} and Anne {Melis} and Frank {Billek}",
    year = "2021",
    publisher = "Schreibstark-Verlag",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/1042880"
}