Verba, S., & Nie, N. H. Participation in America: Political democracy an social equality. University of Chicago Press.
Lua i Stíl Chicago (17ú heag.)Verba, Sidney, agus Norman H. Nie. Participation in America: Political Democracy an Social Equality. Chicago: University of Chicago Press.
Lua MLA (9ú heag.)Verba, Sidney, agus Norman H. Nie. Participation in America: Political Democracy an Social Equality. University of Chicago Press.
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