@book { BildungundErziehunginderDDR,
    title = "Bildung und Erziehung in der DDR",
    author = "Claudia {Proske}",
    year = "2002",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638160483",
    url = "https://www.hausarbeiten.de/document/9315"
}