Namtan Siriboon และ Pattama Sappapan. (2008) TOEIC preparation course at Toyota Motor Thailand : the impact of English language development on employees. Thammasat University:ม.ป.ท.Namtan Siriboon และ Pattama Sappapan. 2008. TOEIC preparation course at Toyota Motor Thailand : the impact of English language development on employees. ม.ป.ท.:Thammasat University;Namtan Siriboon และ Pattama Sappapan. TOEIC preparation course at Toyota Motor Thailand : the impact of English language development on employees. ม.ป.ท.:Thammasat University, 2008. Print.