Blaich, T. P., & Baumgartner, J. C. (1950). The challenge of democracy (3d. ed.). Harper.
Lua i Stíl Chicago (17ú heag.)Blaich, Theodore Paul, agus Joseph Cornelius Baumgartner. The Challenge of Democracy. 3d. ed. New York: Harper, 1950.
Lua MLA (8ú heag.)Blaich, Theodore Paul, agus Joseph Cornelius Baumgartner. The Challenge of Democracy. 3d. ed. Harper, 1950.
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