@book { RudolfvonHabsburg,
    title = "Rudolf von Habsburg",
    subtitle = "Königliche Landfriedenspolitik im Spiegel zeitgenössischer Chronistik",
    author = "Ulrike {Stutzky}",
    year = "2001",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1091803"
}