@book { GewinnversprechenvonVersandfirmen,
    title = "Gewinnversprechen von Versandfirmen",
    author = "Götz {Wied}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1095854"
}