Walker, D. B. (1981). Toward a functioning federalism. Winthrop.
Lua i Stíl Chicago (17ú heag.)Walker, David Bradstreet. Toward a Functioning Federalism. Cambridge, MA: Winthrop, 1981.
Lua MLA (9ú heag.)Walker, David Bradstreet. Toward a Functioning Federalism. Winthrop, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.