Noel Kok Hwee Chia, Esther Yap & Angie Gek Tee Ng. 2010. “An Analysis of Verb Pattern Errors in Active-Passive Passive-Active Sentence Transformation in English Made by Upper Primary Singaporean & Malaysian Chinese Children With Specific Language Impairment”. Journal of the American Academy of Special Education Professionals 5 (2): 96-141. https://doi.org/10.64546/jaasep.108.