Okungeziwe okungu-30% manje
Sabelana kanjani ngezibalo, sivikele udaba, i-collabokind, kodwa sikwenze okufanayo ngokuphepha. U-Steen R, u-Hamer R, u-Lieberman J (2007) Ukulinganisa Umthamo Wengqondo ngokuzungezile Ukufanekisa kuka-MR: Umthelela Wokunemba Kwesilinganiso Nokuhlukahluka Kwemvelo Ezimfuneko Zosayizi Wesampula.
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