Cita APA (7a ed.)

Toynbee, A., & Somervell, D. C. (1949). A study of history (2nd impression.). Oxford University Press.

Cita Chicago Style (17a ed.)

Toynbee, Arnold, y D. C. Somervell. A Study of History. 2nd impression. London [etc.]: Oxford University Press, 1949.

Cita MLA (9a ed.)

Toynbee, Arnold, y D. C. Somervell. A Study of History. 2nd impression. Oxford University Press, 1949.