@book { DieMachtdesVerborgenen,
    title = "Die Macht des Verborgenen",
    author = "Nadja Anne {Kroker} and Elmar {Schenkel}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1108749"
}