@book { ErziehungundBildunginderDDR,
    title = "Erziehung und Bildung in der DDR",
    author = "Yvonne {Sindermann}",
    year = "2005",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638393966",
    url = "https://www.hausarbeiten.de/document/41043"
}