Não informado. (1927). Bulletin of the International Bureau of Education. International Bureau of Education.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Bulletin of the International Bureau of Education. Geneve, Suíça: International Bureau of Education, 1927.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Bulletin of the International Bureau of Education. International Bureau of Education, 1927.
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