@book { bungsbuchzurKommunikationspolitik,
    title = "Übungsbuch zur Kommunikationspolitik",
    author = "Manfred {Bruhn}",
    year = "2011",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1220847"
}