@book { SkateboardingUntersuchungenzueinersportivenJugendkultur,
    title = "Skateboarding. Untersuchungen zu einer sportiven Jugendkultur",
    author = "Ralph {Kietzke}",
    year = "2002",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638110259",
    url = "https://www.hausarbeiten.de/document/1656"
}