Robert K. Carr, M. H. B. Essentials of American democracy. Holf, Rinehart and Winston Inc.
Lua i Stíl Chicago (17ú heag.)Robert K. Carr, Marver H. Bernstein. Essentials of American Democracy. Holf, Rinehart and Winston Inc.
Lua MLA (8ú heag.)Robert K. Carr, Marver H. Bernstein. Essentials of American Democracy. Holf, Rinehart and Winston Inc.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.