@book { DasKonzeptderFreizeitbildung,
    title = "Das Konzept der Freizeitbildung",
    author = "Sandra {Tabache}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832415891",
    url = "https://m.diplom.de/document/217429"
}