Cornwell, E. E. (1965). Presidential leadership of public opinion. Indiana University Press.
Lua i Stíl Chicago (17ú heag.)Cornwell, Elmer E. Presidential Leadership of Public Opinion. Bloomington: Indiana University Press, 1965.
Lua MLA (9ú heag.)Cornwell, Elmer E. Presidential Leadership of Public Opinion. Indiana University Press, 1965.
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