Dahl, R. A. (1966). Political oppositions in Western democracies. Yale University Press.
Lua i Stíl Chicago (17ú heag.)Dahl, Robert Alan. Political Oppositions in Western Democracies. New Haven: Yale University Press, 1966.
Lua MLA (9ú heag.)Dahl, Robert Alan. Political Oppositions in Western Democracies. Yale University Press, 1966.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.