@book { WasmotiviertGrundschulkinder,
    title = "Was motiviert Grundschulkinder?",
    author = "Madeleine {Kunze}",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640936441",
    url = "https://www.hausarbeiten.de/document/173430"
}