UNESCO. (1955). World survey of education: Handbook of educational organization and statistics.
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Cita Chicago (17th ed.)
UNESCO. World Survey of Education: Handbook of Educational Organization and Statistics. 1955.
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Cita MLA (9th ed.)
UNESCO. World Survey of Education: Handbook of Educational Organization and Statistics. 1955.
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Atenció: Aquestes cites poden no estar 100% correctes.