@book { WeltalsRtselundGeheimnis,
    title = "Welt als Rätsel und Geheimnis?",
    author = "Max {Kerner} and Beate {Wunsch}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1083676"
}