Keil, H. Work, Democracy, and Culture in the Ninetheenth-Century America: Hartmut Keil. Democracy and the arts in the United States.(1996).

Keil, Hartmut. "Work, Democracy, and Culture in the Ninetheenth-Century America: Hartmut Keil." Democracy and the Arts in the United States.(1996) .

Keil, Hartmut. "Work, Democracy, and Culture in the Ninetheenth-Century America: Hartmut Keil." Democracy and the Arts in the United States.(1996), .