Ketcham, R. (2004). The Idea of Democracy in the Modern Era. University Press of Kansas.
Lua i Stíl Chicago (17ú heag.)Ketcham, Ralph. The Idea of Democracy in the Modern Era. Lawrence, Kan.: University Press of Kansas, 2004.
Lua MLA (9ú heag.)Ketcham, Ralph. The Idea of Democracy in the Modern Era. University Press of Kansas, 2004.
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