@book { PolitischeBildunginderGrundschule,
    title = "Politische Bildung in der Grundschule",
    author = "Marie-Christin {Martens}",
    year = "2010",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640555062",
    url = "https://www.hausarbeiten.de/document/144449"
}