Die getallerytoets: die formulering en eksperimentele toepassing van 'n algemene model vir die konstruksie van getallerye met verskillende moeilikheidsgrade
(1976) Die getallerytoets :die formulering en eksperimentele toepassing van n algemene model vir die konstruksie van getallerye met verskillende moeilikheidsgrade . http://hdl.handle.net/20.500.11910/18369 http://hdl.handle.net/20.500.11910/18369 http://hdl.handle.net/20.500.11910/18369
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