Commission on International Development., Ward, B., Runnalls, J. D., D'Anjou, L., & Columbia Conference on International Economic Development. (1971). The Widening gap: Development in the 1970's : a report on the Columbia Conference on International Economic Development, Williamsburg, Virginia, and New York, February 15-21, 1970. New York: Columbia University Press.

Commission on International Development., Barbara Ward, J. D. Runnalls, Lenore D'Anjou, and Columbia Conference on International Economic Development. The Widening Gap: Development in the 1970's : A Report On the Columbia Conference On International Economic Development, Williamsburg, Virginia, and New York, February 15-21, 1970. New York: Columbia University Press, 1971.

Commission on International Development., et al. The Widening Gap: Development in the 1970's : A Report On the Columbia Conference On International Economic Development, Williamsburg, Virginia, and New York, February 15-21, 1970. New York: Columbia University Press, 1971.