Odegard, P. H., & Helms, E. A. (1947). American politics, a study in political dynamics (2d ed.). Harper.
Lua i Stíl Chicago (17ú heag.)Odegard, Peter H., agus E. Allen Helms. American Politics, a Study in Political Dynamics. 2d ed. New York: Harper, 1947.
Lua MLA (8ú heag.)Odegard, Peter H., agus E. Allen Helms. American Politics, a Study in Political Dynamics. 2d ed. Harper, 1947.
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