APA

(1991). The Sex and age distributions of population : the 1990 revision of the United Nations global population estimates and projections. New York: United Nations.

Chicago

1991. The Sex and age distributions of population : the 1990 revision of the United Nations global population estimates and projections. New York: United Nations.

Harvard

(1991). The Sex and age distributions of population : the 1990 revision of the United Nations global population estimates and projections. New York: United Nations.

MLA

The Sex and age distributions of population : the 1990 revision of the United Nations global population estimates and projections. New York: United Nations. 1991.