@book { PublicRelationsundVoorlichtingindenNiederlanden,
    title = "Public Relations und Voorlichting in den Niederlanden",
    author = "Sven {Ollmann}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/218715"
}