Não informado. (1950). Educational Researcher. American Educational Research Association.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Educational Researcher. Washington: American Educational Research Association, 1950.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Educational Researcher. American Educational Research Association, 1950.
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