Toynbee, A. J., & Somervell, D. (1946). A study of history. Geoffrey Cumberlege, Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Toynbee, Arnold J., agus D.C Somervell. A Study of History. London: Geoffrey Cumberlege, Oxford University Press, 1946.
Lua MLA (9ú heag.)Toynbee, Arnold J., agus D.C Somervell. A Study of History. Geoffrey Cumberlege, Oxford University Press, 1946.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.