@book { Bowling,
    title = "Bowling",
    subtitle = "Geschichte & Regeln. Ausrüstung & Technik. Mit vielen Tipps & Adressen",
    author = "Katrin {Höfer}",
    year = "2010",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403497"
}