Janda, K., & Berry, J. M. &. G. (1992). The Challenge of democracy: Government America. Houghton Mifflin.
Lua i Stíl Chicago (17ú heag.)Janda, Kenneth, agus Jeffrey M. & Goldman Berry. The Challenge of Democracy: Government America. Boston: Houghton Mifflin, 1992.
Lua MLA (9ú heag.)Janda, Kenneth, agus Jeffrey M. & Goldman Berry. The Challenge of Democracy: Government America. Houghton Mifflin, 1992.
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