@book { FabianismusundBernsteinscherRevisionismus18841900,
    title = "Fabianismus und Bernstein'scher Revisionismus 1884-1900",
    author = "Herbert {Frei}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1070925"
}