Cita APA (7th ed.)

United Nations. Department for Economic and Social Information and Policy Analysis. Population Division. (1995). The Challenge of urbanization: The world?s large cities. United Nations.

Cita Chicago (17th ed.)

United Nations. Department for Economic and Social Information and Policy Analysis. Population Division. The Challenge of Urbanization: The World?s Large Cities. New York: United Nations, 1995.

Cita MLA (9th ed.)

United Nations. Department for Economic and Social Information and Policy Analysis. Population Division. The Challenge of Urbanization: The World?s Large Cities. United Nations, 1995.