@book { ExpressionismusundPolitik,
    title = "Expressionismus und Politik",
    author = "Christoph {Eyring}",
    year = "2006",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638469166",
    url = "https://www.hausarbeiten.de/document/50775"
}