Não informado. (1928). Journal of Education for Business. Heldref Publications.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Journal of Education for Business. Washington: Heldref Publications, 1928.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Journal of Education for Business. Heldref Publications, 1928.
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