@book { PortrtdesNationalsozialismus,
    title = "Porträt des Nationalsozialismus",
    author = "Leo {Trotzki}",
    year = "2016",
    publisher = "MEHRING Verlag",
    address = "Essen, Germany",
    url = "https://mehring.openpublishing.com/document/321482"
}