Duncan, R., & Goddard, J. (2003). Contemporary America. Palgrave Macmillan.
Lua i Stíl Chicago (17ú heag.)Duncan, Russell, agus Joseph Goddard. Contemporary America. Houndmills, Basingstoke, Hampshire ; New York: Palgrave Macmillan, 2003.
Lua MLA (9ú heag.)Duncan, Russell, agus Joseph Goddard. Contemporary America. Palgrave Macmillan, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.