@book { DiekonstruktivistischeErkenntnistheorie,
    title = "Die konstruktivistische Erkenntnistheorie",
    author = "Sarah {Werner}",
    year = "2008",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640199440",
    url = "https://www.hausarbeiten.de/document/117371"
}