@book { DieKPDundderSpanischeBrgerkrieg19361939,
    title = "Die KPD und der Spanische Bürgerkrieg 1936-1939",
    author = "Ralf {Niemeyer}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832446420",
    url = "https://m.diplom.de/document/220252"
}