Não informado. (1941). Educational and Psychological Measurement. Educational and Psychological Measurement.
Citação do estilo Chicago (17ª ed.)Não informado. Educational and Psychological Measurement. Durham, NC: Educational and Psychological Measurement, 1941.
Citação MLA (8ª ed.)Não informado. Educational and Psychological Measurement. Educational and Psychological Measurement, 1941.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.