Não informado. (1955). International Review of Education. Unesco, Institute for Education.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. International Review of Education. Hamburg, Alemanha: Unesco, Institute for Education, 1955.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. International Review of Education. Unesco, Institute for Education, 1955.
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