@book { GeschichteundneuereEntwicklungendesSkateboardens,
    title = "Geschichte und neuere Entwicklungen des Skateboardens",
    author = "Felix {Hälbich}",
    year = "2008",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836613125",
    url = "https://m.diplom.de/document/225791"
}