@book { Konsumentenverhalten,
    title = "Konsumentenverhalten",
    author = "Werner {Kroeber-Riel} and Andrea {Gröppel-Klein}",
    year = "2019",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1190392"
}