Não informado. (1949). The Vocational Aspect of Education. Colleges of Education Technical.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. The Vocational Aspect of Education. London: Colleges of Education Technical, 1949.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. The Vocational Aspect of Education. Colleges of Education Technical, 1949.
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