@book { DieFreimaurerunddiekatholischeKirche,
    title = "Die Freimaurer und die katholische Kirche",
    author = "Klaus {Kottmann}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1105601"
}