Cita APA

Toynbee, A. J., & Somervell, D. C. (1987). A study of history. New York: Oxford University Press.

Citación estilo Chicago

Toynbee, Arnold J., y D. C. Somervell. A Study of History. New York: Oxford University Press, 1987.

Cita MLA

Toynbee, Arnold J., y D. C. Somervell. A Study of History. New York: Oxford University Press, 1987.