@book { DiePhnomenologiedesentdeckendenLernen,
    title = "Die Phänomenologie des entdeckenden Lernen",
    author = "Romy {Thiel}",
    year = "2002",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638143158",
    url = "https://www.hausarbeiten.de/document/6829"
}