Cita APA

(1989). Global estimates and projections of population by sex and age: The 1988 revision. New York: United Nations.

Citación estilo Chicago

Global Estimates and Projections of Population By Sex and Age: The 1988 Revision. New York: United Nations, 1989.

Cita MLA

Global Estimates and Projections of Population By Sex and Age: The 1988 Revision. New York: United Nations, 1989.