@book { DaswarenWintermonatevollerArbeitHoffenundGlck,
    title = "«Das waren Wintermonate voller Arbeit, Hoffen und Glück ...»",
    subtitle = "Die Novemberrevolution 1918 in Grundzügen",
    author = "Heidi {Beutin} and Wolfgang {Beutin} and Ralph {Müller-Beck}",
    year = "2010",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1135516"
}