APA
United Nations. Department of International Economic and Social Affairs and World Health Organization, . (1982). Levels and trends of mortality since 1950. New York: United Nations.
Chicago
United Nations. Department of International Economic and Social Affairs and World Health Organization, . 1982. Levels and trends of mortality since 1950. New York: United Nations.
Harvard
United Nations. Department of International Economic and Social Affairs and World Health Organization, . (1982). Levels and trends of mortality since 1950. New York: United Nations.
MLA
United Nations. Department of International Economic and Social Affairs and World Health Organization, . Levels and trends of mortality since 1950. New York: United Nations. 1982.