@book { BetriebsformenimAutomobilhandel,
    title = "Betriebsformen im Automobilhandel",
    author = "Christian {Stallkamp}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1107580"
}