Janda, K., Berry, J. M., & Goldman, J. (2008). The challenge of democracy: Government in America : 2008 update edition (Brief ed., 6th ed.). Houghton Mifflin.
Lua i Stíl Chicago (17ú heag.)Janda, Kenneth, Jeffrey M. Berry, agus Jerry Goldman. The Challenge of Democracy: Government in America : 2008 Update Edition. Brief ed., 6th ed. Boston: Houghton Mifflin, 2008.
Lua MLA (9ú heag.)Janda, Kenneth, et al. The Challenge of Democracy: Government in America : 2008 Update Edition. Brief ed., 6th ed. Houghton Mifflin, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.