@book { VomKuferzumMitgestalter,
    title = "Vom Käufer zum Mitgestalter",
    author = "Tobias {Bischkopf}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1135725"
}