Ruja Pholsward และ Supatra Pradubpongse. (2015) Oral Discourse Performance of Bilingual Learners at the Primary and Secondary Levels. <i>RANGSIT JOURNAL OF EDUCATIONAL STUDIES</i>, <i>2</i>(1), 85-114.Ruja Pholsward และ Supatra Pradubpongse. "Oral Discourse Performance of Bilingual Learners at the Primary and Secondary Levels". RANGSIT JOURNAL OF EDUCATIONAL STUDIES 2 (2015):85-114.Ruja Pholsward และ Supatra Pradubpongse. Oral Discourse Performance of Bilingual Learners at the Primary and Secondary Levels. Rangsit University, Pathum Thani, Thailand:ม.ป.ท. 2015.