@book { DieparlamentarischeOppositioninderBundesrepublikDeutschland,
    title = "Die parlamentarische Opposition in der Bundesrepublik Deutschland",
    author = "Patrick {Fengler}",
    year = "2003",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638187251",
    url = "https://www.hausarbeiten.de/document/12956"
}