@book { SelbstgesteuertesLernen,
    title = "Selbstgesteuertes Lernen",
    author = "Lena {Meyer}",
    year = "2009",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640360383",
    url = "https://www.hausarbeiten.de/document/129173"
}