@book { ComputerspieleversusSpieler,
    title = "Computerspiele versus Spieler",
    author = "Markus {Schöfthaler}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832419264",
    url = "https://m.diplom.de/document/217773"
}