Norton, D., & Norton, D. (1993). From 1700 to the present day. Cambridge Univ. Press.
Lua i Stíl Chicago (17ú heag.)Norton, David, agus David Norton. From 1700 to the Present Day. Cambridge [u.a.]: Cambridge Univ. Press, 1993.
Lua MLA (8ú heag.)Norton, David, agus David Norton. From 1700 to the Present Day. Cambridge Univ. Press, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.