Toynbee, A. (1962). America and the world revolution: Public lectures delivered at the university of Pennsylvania, Sping 1961. New York: Oxford University Press.

Toynbee, Arnold. America and the World Revolution: Public Lectures Delivered At the University of Pennsylvania, Sping 1961. New York: Oxford University Press, 1962.

Toynbee, Arnold. America and the World Revolution: Public Lectures Delivered At the University of Pennsylvania, Sping 1961. New York: Oxford University Press, 1962.