@book { StaatlichkeitimWandel,
    title = "Staatlichkeit im Wandel",
    author = "Mara {Rebmann}",
    year = "2013",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656462385",
    url = "https://www.hausarbeiten.de/document/229909"
}