@book { UmLandundKonfession,
    title = "Um Land und Konfession",
    subtitle = "Die Außen- und Reichspolitik Württembergs (1628-1638)",
    author = "Stefan {Zizelmann}",
    year = "2002",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1094355"
}