Unesco. (1949). A handbook for the improvement of textbooks and teaching materials as aids to international understanding. UNESCO.
Citace podle Chicago (17th ed.)Unesco. A Handbook for the Improvement of Textbooks and Teaching Materials as Aids to International Understanding. Paris: UNESCO, 1949.
Citace podle MLA (8th ed.)Unesco. A Handbook for the Improvement of Textbooks and Teaching Materials as Aids to International Understanding. UNESCO, 1949.
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