@book { Weihnachten,
    title = "Weihnachten",
    author = "Hermann Josef {Riedl} and Dorothee {Schlenke}",
    year = "2020",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b17836",
    url = "https://www.peterlang.com/document/1111332"
}