Polsby, N. W. (2004). How Congress evolves: Social bases of institutional change. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Polsby, Nelson W. How Congress Evolves: Social Bases of Institutional Change. New York: Oxford University Press, 2004.
Lua MLA (9ú heag.)Polsby, Nelson W. How Congress Evolves: Social Bases of Institutional Change. Oxford University Press, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.