@book { DiekleinePensionanderAlster,
    title = "Die kleine Pension an der Alster",
    subtitle = "Roman",
    author = "Christian {Pfannenschmidt}",
    year = "2020",
    publisher = "dotbooks Verlag",
    address = "München, Germany",
    url = "https://www.dotbooks.de/document/539165"
}