@book { Tagebcher,
    title = "Tagebücher",
    subtitle = "Vom 11. August 1835 bis 10. Okstober 1858- Nachdruck",
    author = "Karl August {Varnhagen von Ense}",
    year = "1973",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1069346"
}