Lavrakas, P. J., & Holley, J. K. (1991). Polling and presidential election coverage. Sage Publications.
Lua i Stíl Chicago (17ú heag.)Lavrakas, Paul J., agus Jack K. Holley. Polling and Presidential Election Coverage. Newbury Park, Calif.: Sage Publications, 1991.
Lua MLA (8ú heag.)Lavrakas, Paul J., agus Jack K. Holley. Polling and Presidential Election Coverage. Sage Publications, 1991.
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