Janda, K., Berry, J. M., Goldman, J., & Huff, E. (1990). The challenge of democracy: Government in America (Brief ed.). Houghton Mifflin.
Lua i Stíl Chicago (17ú heag.)Janda, Kenneth, Jeffrey M. Berry, Jerry Goldman, agus Earl Huff. The Challenge of Democracy: Government in America. Brief ed. Boston: Houghton Mifflin, 1990.
Lua MLA (8ú heag.)Janda, Kenneth, et al. The Challenge of Democracy: Government in America. Brief ed. Houghton Mifflin, 1990.
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