@book { PolitischeBildunginderDDR,
    title = "Politische Bildung in der DDR",
    author = "Eva {Heidingsfelder} and Bianca {Reichinger}",
    year = "2005",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638341981",
    url = "https://www.hausarbeiten.de/document/33812"
}