@book { DerSchaffsteinVerlag,
    title = "Der Schaffstein Verlag",
    subtitle = "Verlagsgeschichte und Bibliographie der Publikationen 1894-1973",
    author = "Roland {Stark}",
    year = "2003",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1095842"
}