Não informado. (1927). Bulletin of the International Bureau of Education. International Bureau of Education.
Citace podle Chicago (17th ed.)Não informado. Bulletin of the International Bureau of Education. Geneve, Suíça: International Bureau of Education, 1927.
Citace podle MLA (8th ed.)Não informado. Bulletin of the International Bureau of Education. International Bureau of Education, 1927.
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