@book { DieOppositionsparteiSPDimBundesrat,
    title = "Die Oppositionspartei SPD im Bundesrat",
    author = "Hendrik {Träger}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1104986"
}