@book { DieInstitutionalisierungdesImperiums,
    title = "Die Institutionalisierung des Imperiums",
    author = "Ralph {Sowart}",
    year = "2008",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640189397",
    url = "https://www.hausarbeiten.de/document/117034"
}