Yeric, J. L., & Todd, J. R. (1989). Public opinion: The visible politics (2nd ed.). F.E. Peacock Publishers.
Lua i Stíl Chicago (17ú heag.)Yeric, Jerry L., agus John R. Todd. Public Opinion: The Visible Politics. 2nd ed. Itasca, Ill: F.E. Peacock Publishers, 1989.
Lua MLA (9ú heag.)Yeric, Jerry L., agus John R. Todd. Public Opinion: The Visible Politics. 2nd ed. F.E. Peacock Publishers, 1989.
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