Não informado. (1968). Journal of Educational Measurement. National Council on Measurement in Education.
Citação do estilo Chicago (17ª ed.)Não informado. Journal of Educational Measurement. Washington: National Council on Measurement in Education, 1968.
Citação MLA (8ª ed.)Não informado. Journal of Educational Measurement. National Council on Measurement in Education, 1968.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.