Tuntiga Pollap. 2010. The relationship between American cultural background knowledge and the English proficiency of Thai English major students. Loei province:Loei Rajabhat Unvierstiy;
Tuntiga Pollap. (2010) The relationship between American cultural background knowledge and the English proficiency of Thai English major students (รายงานผลงานวิจัย). Loei Rajabhat Unvierstiy:Loei province.
Tuntiga Pollap. The relationship between American cultural background knowledge and the English proficiency of Thai English major students. Loei province:Loei Rajabhat Unvierstiy, 2010.
Tuntiga Pollap. (2010) The relationship between American cultural background knowledge and the English proficiency of Thai English major students (รายงานผลงานวิจัย). Loei Rajabhat Unvierstiy:Loei province.