@book { TheDawningofChristianityinPolandandacrossCentralandEasternEurope,
    title = "The Dawning of Christianity in Poland and across Central and Eastern Europe",
    author = "Igor {Kąkolewski} and Przemyslaw {Urbánczyk} and Christian {Lübke}",
    year = "2019",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b15997",
    url = "https://www.peterlang.com/document/1056950"
}