APA

United Nations . Department of international economic and social affairs, . (1989). The United nations population projection computer program. New York: U.N. Department.

Chicago

United Nations . Department of international economic and social affairs, . 1989. The United nations population projection computer program. New York: U.N. Department.

Harvard

United Nations . Department of international economic and social affairs, . (1989). The United nations population projection computer program. New York: U.N. Department.

MLA

United Nations . Department of international economic and social affairs, . The United nations population projection computer program. New York: U.N. Department. 1989.