@book { EntwicklungderProfitrateamBeispielvonDeutschland,
    title = "Entwicklung der Profitrate am Beispiel von Deutschland",
    author = "Robert {Schmargendorf}",
    year = "2015",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/299309"
}