Ball, G. T., & Rosch, L. J. (1973). Civics (New rev. ed.). Follett Pub. Co.
Lua i Stíl Chicago (17ú heag.)Ball, Grant T., agus Lee J. Rosch. Civics. New rev. ed. Chicago: Follett Pub. Co, 1973.
Lua MLA (8ú heag.)Ball, Grant T., agus Lee J. Rosch. Civics. New rev. ed. Follett Pub. Co, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.