Commons, J. R. (1896). Proportional representation. T. Y. Crowell & co.
Lua i Stíl Chicago (17ú heag.)Commons, John R. Proportional Representation. New York, Boston: T. Y. Crowell & co, 1896.
Lua MLA (8ú heag.)Commons, John R. Proportional Representation. T. Y. Crowell & co, 1896.
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