APA
United Nations. Population Division. Department of International Economic and Social Affairs, . (1998). World population projections to 2150. New York: United Nations.
Chicago
United Nations. Population Division. Department of International Economic and Social Affairs, . 1998. World population projections to 2150. New York: United Nations.
Harvard
United Nations. Population Division. Department of International Economic and Social Affairs, . (1998). World population projections to 2150. New York: United Nations.
MLA
United Nations. Population Division. Department of International Economic and Social Affairs, . World population projections to 2150. New York: United Nations. 1998.