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Dyfyniad Arddull ChicagoButcher, H.J. Human Intelligence: Its Nature and Assessment. London: Methun & Co, 1968.
Dyfyniad MLAButcher, H.J. Human Intelligence: Its Nature and Assessment. Methun & Co, 1968.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.