@book { AnnaSiemsenBildungundLiteratur,
    title = "Anna Siemsen – Bildung und Literatur",
    author = "Christoph {Sänger}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1107748"
}