@book { Bttenreden,
    title = "Büttenreden",
    subtitle = "Witzige Reden für die 5. Jahreszeit. Tipps für gelungene Vorträge",
    author = "Sven {Hansel}",
    year = "2010",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403484"
}