Não informado. (1949). The Vocational Aspect of Education. Colleges of Education Technical.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. The Vocational Aspect of Education. London: Colleges of Education Technical, 1949.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. The Vocational Aspect of Education. Colleges of Education Technical, 1949.
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