@book { InternetWerbungimeuropischenBinnenmarkt,
    title = "Internet-Werbung im europäischen Binnenmarkt",
    author = "Ralf {Morshäuser}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1094098"
}