United Nations. Department of Economic and Social Affairs. (1955). Estudio economico mundial. [s.n.].
Cita Chicago (17th ed.)United Nations. Department of Economic and Social Affairs. Estudio Economico Mundial. New York: [s.n.], 1955.
Cita MLA (9th ed.)United Nations. Department of Economic and Social Affairs. Estudio Economico Mundial. [s.n.], 1955.
Atenció: Aquestes cites poden no estar 100% correctes.