@book { UnternehmensundMarketingkommunikation,
    title = "Unternehmens- und Marketingkommunikation",
    author = "Manfred {Bruhn}",
    year = "2014",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1220926"
}