Robson, S. T. (1966). Left-wing liberalism in Germany, 1900-19. University of Oxford.
Lua i Stíl Chicago (17ú heag.)Robson, S. T. Left-wing Liberalism in Germany, 1900-19. England: University of Oxford, 1966.
Lua MLA (8ú heag.)Robson, S. T. Left-wing Liberalism in Germany, 1900-19. University of Oxford, 1966.
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