@book { HeinrichBullingerseuropischeKirchenpolitik,
    title = "Heinrich Bullingers europäische Kirchenpolitik",
    author = "Andreas {Mühling}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1092870"
}