Natwipa Wanicharoen และ Pongsak Noipayak. (2019) Risk Factors Associated with Specific Language Impairment in Preschool Children at Division of Developmental and Behavioural Paediatrics Faculty of Medicine Vajira Hospital: A Matched Case-Control Study. <i>Vajira Medical Journal</i>, <i>63</i>(6), 423-442.Natwipa Wanicharoen และ Pongsak Noipayak. "Risk Factors Associated with Specific Language Impairment in Preschool Children at Division of Developmental and Behavioural Paediatrics Faculty of Medicine Vajira Hospital: A Matched Case-Control Study". Vajira Medical Journal 63 (2019):423-442.Natwipa Wanicharoen และ Pongsak Noipayak. Risk Factors Associated with Specific Language Impairment in Preschool Children at Division of Developmental and Behavioural Paediatrics Faculty of Medicine Vajira Hospital: A Matched Case-Control Study. Text and Journal Publication:ม.ป.ท. 2019.