@book { CrossmediaStrategien,
    title = "Crossmedia-Strategien",
    author = "Tobias {Lüling}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832459109",
    url = "https://m.diplom.de/document/221363"
}