Pornthip Wutigornsombatkul. 2004. study of high school students' understanding and usages of english referencesPornthip Wutigornsombatkul. Field of Study Communicative English, Ramkhamhaeng University;
Pornthip Wutigornsombatkul. (2004) study of high school students' understanding and usages of english referencesPornthip Wutigornsombatkul . Ramkhamhaeng University/Bangkok.