@book { Werbunggrenzenlos,
    title = "Werbung – grenzenlos",
    author = "Gudrun {Bachleitner-Held} and Sylvia {Bendel}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1104771"
}