Não informado. (1941). Educational and Psychological Measurement. Educational and Psychological Measurement.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Educational and Psychological Measurement. Durham, NC: Educational and Psychological Measurement, 1941.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Educational and Psychological Measurement. Educational and Psychological Measurement, 1941.
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