@book { BildungssystemeimVergleich,
    title = "Bildungssysteme im Vergleich",
    author = "Katrin {Schenk}",
    year = "2007",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638907149",
    url = "https://www.hausarbeiten.de/document/83502"
}