Nations Unies. Division de statistique. (1949). Statistical yearbook. United Nations.
Cita Chicago (17th ed.)Nations Unies. Division de statistique. Statistical Yearbook. New York [etc.]: United Nations, 1949.
Cita MLA (8th ed.)Nations Unies. Division de statistique. Statistical Yearbook. United Nations, 1949.
Atenció: Aquestes cites poden no estar 100% correctes.