@book { Marketingmanagement,
    title = "Marketingmanagement",
    author = "Brian {Rüeger} and Adis {Merdzanovic} and Saskia {Wyss}",
    year = "2022",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1221413"
}