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Dyfyniad Arddull ChicagoWEISS DAVID J. NEW HORIZONS IN TESTING. NEW YORK: ACADEMIC PRESS, 1983.
Dyfyniad MLAWEISS DAVID J. NEW HORIZONS IN TESTING. ACADEMIC PRESS, 1983.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.