Cita APA (7th ed.)

Economist Publications (Firm). (1980). The World in figures. Facts on File.

Cita Chicago (17th ed.)

Economist Publications (Firm). The World in Figures. New York: Facts on File, 1980.

Cita MLA (8th ed.)

Economist Publications (Firm). The World in Figures. Facts on File, 1980.