Tuanchai Tan-ngarmtrong. 1988. The relationship of English reading proficiency to academic achievement of NIDA students. Bangkok:NIDA Language Center;
Tuanchai Tan-ngarmtrong. (1988) The relationship of English reading proficiency to academic achievement of NIDA students (รายงานผลงานวิจัย). NIDA Language Center:Bangkok.
Tuanchai Tan-ngarmtrong. The relationship of English reading proficiency to academic achievement of NIDA students. Bangkok:NIDA Language Center, 1988.
Tuanchai Tan-ngarmtrong. (1988) The relationship of English reading proficiency to academic achievement of NIDA students (รายงานผลงานวิจัย). NIDA Language Center:Bangkok.