Keil, H. Work, Democracy, and Culture in the Ninetheenth-Century America: Hartmut Keil. Democracy and the arts in the United States.(1996).
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKeil, Hartmut. "Work, Democracy, and Culture in the Ninetheenth-Century America: Hartmut Keil." Democracy and the Arts in the United States.(1996) .
एमएलए (8वां संस्करण) प्रशस्ति पत्रKeil, Hartmut. "Work, Democracy, and Culture in the Ninetheenth-Century America: Hartmut Keil." Democracy and the Arts in the United States.(1996), .
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