Ziefle, H. Historical forces, German departments, and the curriculum in small liberal arts colleges in the Midwest: Helmut Ziefle. Teaching German in twentieth century America.(2001).
Чикаго стиль цитування (17-те видання)Ziefle, Helmut. "Historical Forces, German Departments, and the Curriculum in Small Liberal Arts Colleges in the Midwest: Helmut Ziefle." Teaching German in Twentieth Century America.(2001) .
Стиль цитування MLA (8-ме видання)Ziefle, Helmut. "Historical Forces, German Departments, and the Curriculum in Small Liberal Arts Colleges in the Midwest: Helmut Ziefle." Teaching German in Twentieth Century America.(2001), .
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