Rudchadaporn Enija และ Sudsabuy Chulakadabba. (2011) The effect of language and cultural environment of intelligence test performance of hill tribe students. Mahidol University:ม.ป.ท.Rudchadaporn Enija และ Sudsabuy Chulakadabba. 2011. The effect of language and cultural environment of intelligence test performance of hill tribe students. ม.ป.ท.:Mahidol University;Rudchadaporn Enija และ Sudsabuy Chulakadabba. The effect of language and cultural environment of intelligence test performance of hill tribe students. ม.ป.ท.:Mahidol University, 2011. Print.