@book { DieGrndungderZentrumspartei,
    title = "Die Gründung der Zentrumspartei",
    author = "Ulrich {Arnold}",
    year = "2001",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638973601",
    url = "https://www.hausarbeiten.de/document/98910"
}